diff --git a/src/uvw/async.h b/src/uvw/async.h
index 04471091..e326bac4 100644
--- a/src/uvw/async.h
+++ b/src/uvw/async.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_ASYNC_INCLUDE_H
+#define UVW_ASYNC_INCLUDE_H
 
 
 #include <uv.h>
@@ -61,3 +62,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "async.cpp"
 #endif
+
+#endif // UVW_ASYNC_INCLUDE_H
diff --git a/src/uvw/check.h b/src/uvw/check.h
index 4f7e856b..4d3e5718 100644
--- a/src/uvw/check.h
+++ b/src/uvw/check.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_CHECK_INCLUDE_H
+#define UVW_CHECK_INCLUDE_H
 
 
 #include <uv.h>
@@ -58,3 +59,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "check.cpp"
 #endif
+
+#endif // UVW_CHECK_INCLUDE_H
diff --git a/src/uvw/dns.h b/src/uvw/dns.h
index 7e403f1d..e9b2e860 100644
--- a/src/uvw/dns.h
+++ b/src/uvw/dns.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_DNS_INCLUDE_H
+#define UVW_DNS_INCLUDE_H
 
 
 #include <utility>
@@ -250,3 +251,5 @@ extern template std::pair<bool, std::pair<const char *, const char *>> GetNameIn
 #ifndef UVW_AS_LIB
 #include "dns.cpp"
 #endif
+
+#endif // UVW_DNS_INCLUDE_H
diff --git a/src/uvw/emitter.h b/src/uvw/emitter.h
index fbf0aa7f..a189f3a6 100644
--- a/src/uvw/emitter.h
+++ b/src/uvw/emitter.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_EMITTER_INCLUDE_H
+#define UVW_EMITTER_INCLUDE_H
 
 
 #include <type_traits>
@@ -319,3 +320,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "emitter.cpp"
 #endif
+
+#endif // UVW_EMITTER_INCLUDE_H
diff --git a/src/uvw/fs.h b/src/uvw/fs.h
index 147247f3..c4af1d4a 100644
--- a/src/uvw/fs.h
+++ b/src/uvw/fs.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_FS_INCLUDE_H
+#define UVW_FS_INCLUDE_H
 
 
 #include <utility>
@@ -1457,3 +1458,5 @@ struct FsHelper {
 #ifndef UVW_AS_LIB
 #include "fs.cpp"
 #endif
+
+#endif // UVW_FS_INCLUDE_H
diff --git a/src/uvw/fs_event.h b/src/uvw/fs_event.h
index 4e2a4e58..6cbc5a08 100644
--- a/src/uvw/fs_event.h
+++ b/src/uvw/fs_event.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_FS_EVENT_INCLUDE_H
+#define UVW_FS_EVENT_INCLUDE_H
 
 
 #include <type_traits>
@@ -144,3 +145,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "fs_event.cpp"
 #endif
+
+#endif // UVW_FS_EVENT_INCLUDE_H
diff --git a/src/uvw/fs_poll.h b/src/uvw/fs_poll.h
index 2fac8325..a264eb3b 100644
--- a/src/uvw/fs_poll.h
+++ b/src/uvw/fs_poll.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_FS_POLL_INCLUDE_H
+#define UVW_FS_POLL_INCLUDE_H
 
 
 #include <string>
@@ -78,3 +79,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "fs_poll.cpp"
 #endif
+
+#endif // UVW_FS_POLL_INCLUDE_H
diff --git a/src/uvw/handle.hpp b/src/uvw/handle.hpp
index b18edd1f..274f4fc5 100644
--- a/src/uvw/handle.hpp
+++ b/src/uvw/handle.hpp
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_HANDLE_INCLUDE_H
+#define UVW_HANDLE_INCLUDE_H
 
 
 #include <cstddef>
@@ -272,3 +273,5 @@ public:
 
 
 }
+
+#endif // UVW_HANDLE_INCLUDE_H
diff --git a/src/uvw/idle.h b/src/uvw/idle.h
index bb0cf3d7..28a8c120 100644
--- a/src/uvw/idle.h
+++ b/src/uvw/idle.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_IDLE_INCLUDE_H
+#define UVW_IDLE_INCLUDE_H
 
 
 #include <uv.h>
@@ -66,3 +67,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "idle.cpp"
 #endif
+
+#endif // UVW_IDLE_INCLUDE_H
diff --git a/src/uvw/lib.h b/src/uvw/lib.h
index c4e2911b..7e8fff18 100644
--- a/src/uvw/lib.h
+++ b/src/uvw/lib.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_LIB_INCLUDE_H
+#define UVW_LIB_INCLUDE_H
 
 
 #include <memory>
@@ -65,3 +66,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "lib.cpp"
 #endif
+
+#endif // UVW_LIB_INCLUDE_H
diff --git a/src/uvw/loop.h b/src/uvw/loop.h
index 47ad1d7d..9832f0fd 100644
--- a/src/uvw/loop.h
+++ b/src/uvw/loop.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_LOOP_INCLUDE_H
+#define UVW_LOOP_INCLUDE_H
 
 
 #ifdef _WIN32
@@ -435,3 +436,5 @@ extern template bool Loop::run<Loop::Mode::NOWAIT>() noexcept;
 #ifndef UVW_AS_LIB
 #include "loop.cpp"
 #endif
+
+#endif // UVW_LOOP_INCLUDE_H
diff --git a/src/uvw/pipe.h b/src/uvw/pipe.h
index 55847f63..d37ea40a 100644
--- a/src/uvw/pipe.h
+++ b/src/uvw/pipe.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_PIPE_INCLUDE_H
+#define UVW_PIPE_INCLUDE_H
 
 
 #include <type_traits>
@@ -162,3 +163,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "pipe.cpp"
 #endif
+
+#endif // UVW_PIPE_INCLUDE_H
diff --git a/src/uvw/poll.h b/src/uvw/poll.h
index 38acb265..6030fd59 100644
--- a/src/uvw/poll.h
+++ b/src/uvw/poll.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_POLL_INCLUDE_H
+#define UVW_POLL_INCLUDE_H
 
 
 #include <type_traits>
@@ -140,3 +141,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "poll.cpp"
 #endif
+
+#endif // UVW_POLL_INCLUDE_H
diff --git a/src/uvw/prepare.h b/src/uvw/prepare.h
index 6d00af1b..736c7b8b 100644
--- a/src/uvw/prepare.h
+++ b/src/uvw/prepare.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_PREPARE_INCLUDE_H
+#define UVW_PREPARE_INCLUDE_H
 
 
 #include <uv.h>
@@ -60,3 +61,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "prepare.cpp"
 #endif
+
+#endif // UVW_PREPARE_INCLUDE_H
diff --git a/src/uvw/process.h b/src/uvw/process.h
index 9d16363e..f19fcc4d 100644
--- a/src/uvw/process.h
+++ b/src/uvw/process.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_PROCESS_INCLUDE_H
+#define UVW_PROCESS_INCLUDE_H
 
 
 #include <utility>
@@ -249,3 +250,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "process.cpp"
 #endif
+
+#endif // UVW_PROCESS_INCLUDE_H
diff --git a/src/uvw/request.hpp b/src/uvw/request.hpp
index d12e1a18..212ad395 100644
--- a/src/uvw/request.hpp
+++ b/src/uvw/request.hpp
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_REQUEST_INCLUDE_H
+#define UVW_REQUEST_INCLUDE_H
 
 
 #include <type_traits>
@@ -70,3 +71,5 @@ public:
 
 
 }
+
+#endif // UVW_REQUEST_INCLUDE_H
diff --git a/src/uvw/resource.hpp b/src/uvw/resource.hpp
index 3f7b7780..53c8adb2 100644
--- a/src/uvw/resource.hpp
+++ b/src/uvw/resource.hpp
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_RESOURCE_INCLUDE_H
+#define UVW_RESOURCE_INCLUDE_H
 
 
 #include <memory>
@@ -68,3 +69,5 @@ private:
 };
 
 }
+
+#endif // UVW_RESOURCE_INCLUDE_H
diff --git a/src/uvw/signal.h b/src/uvw/signal.h
index 3a837fa1..93b69057 100644
--- a/src/uvw/signal.h
+++ b/src/uvw/signal.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_SIGNAL_INCLUDE_H
+#define UVW_SIGNAL_INCLUDE_H
 
 
 #include <uv.h>
@@ -84,3 +85,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "signal.cpp"
 #endif
+
+#endif // UVW_SIGNAL_INCLUDE_H
diff --git a/src/uvw/stream.h b/src/uvw/stream.h
index 8cfbc002..88d6dc11 100644
--- a/src/uvw/stream.h
+++ b/src/uvw/stream.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_STREAM_INCLUDE_H
+#define UVW_STREAM_INCLUDE_H
 
 
 #include <algorithm>
@@ -445,3 +446,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "stream.cpp"
 #endif
+
+#endif // UVW_STREAM_INCLUDE_H
diff --git a/src/uvw/tcp.h b/src/uvw/tcp.h
index ef8e13e0..2b1e2552 100644
--- a/src/uvw/tcp.h
+++ b/src/uvw/tcp.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_TCP_INCLUDE_H
+#define UVW_TCP_INCLUDE_H
 
 
 #include <type_traits>
@@ -256,3 +257,5 @@ extern template void TCPHandle::connect<IPv6>(Addr addr);
 #ifndef UVW_AS_LIB
 #include "tcp.cpp"
 #endif
+
+#endif // UVW_TCP_INCLUDE_H
diff --git a/src/uvw/thread.h b/src/uvw/thread.h
index a00a114d..912d8a1a 100644
--- a/src/uvw/thread.h
+++ b/src/uvw/thread.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_THREAD_INCLUDE_H
+#define UVW_THREAD_INCLUDE_H
 
 
 #include <memory>
@@ -363,3 +364,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "thread.cpp"
 #endif
+
+#endif // UVW_THREAD_INCLUDE_H
diff --git a/src/uvw/timer.h b/src/uvw/timer.h
index c2da15c0..b1fbb437 100644
--- a/src/uvw/timer.h
+++ b/src/uvw/timer.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_TIMER_INCLUDE_H
+#define UVW_TIMER_INCLUDE_H
 
 
 #include <chrono>
@@ -102,3 +103,5 @@ public:
 #ifndef UVW_AS_LIB
 #include "timer.cpp"
 #endif
+
+#endif // UVW_TIMER_INCLUDE_H
diff --git a/src/uvw/tty.h b/src/uvw/tty.h
index 39ee3dd3..bbfb1ff5 100644
--- a/src/uvw/tty.h
+++ b/src/uvw/tty.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_TTY_INCLUDE_H
+#define UVW_TTY_INCLUDE_H
 
 
 #include <type_traits>
@@ -150,3 +151,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "tty.cpp"
 #endif
+
+#endif // UVW_TTY_INCLUDE_H
diff --git a/src/uvw/udp.h b/src/uvw/udp.h
index a14c8aad..dd6d2cbc 100644
--- a/src/uvw/udp.h
+++ b/src/uvw/udp.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_UDP_INCLUDE_H
+#define UVW_UDP_INCLUDE_H
 
 
 #include <type_traits>
@@ -637,3 +638,5 @@ extern template void UDPHandle::recv<IPv6>();
 #ifndef UVW_AS_LIB
 #include "udp.cpp"
 #endif
+
+#endif // UVW_UDP_INCLUDE_H
diff --git a/src/uvw/underlying_type.hpp b/src/uvw/underlying_type.hpp
index be3e3402..06c4a57f 100644
--- a/src/uvw/underlying_type.hpp
+++ b/src/uvw/underlying_type.hpp
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_UNDERLYING_TYPE_INCLUDE_H
+#define UVW_UNDERLYING_TYPE_INCLUDE_H
 
 
 #include <memory>
@@ -114,3 +115,5 @@ private:
 
 
 }
+
+#endif // UVW_UNDERLYING_TYPE_INCLUDE_H
diff --git a/src/uvw/util.h b/src/uvw/util.h
index 6c2b8e55..42271376 100644
--- a/src/uvw/util.h
+++ b/src/uvw/util.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_UTIL_INCLUDE_H
+#define UVW_UTIL_INCLUDE_H
 
 
 #include <string_view>
@@ -827,3 +828,5 @@ struct Utilities {
 #ifndef UVW_AS_LIB
 #include "util.cpp"
 #endif
+
+#endif // UVW_UTIL_INCLUDE_H
diff --git a/src/uvw/work.h b/src/uvw/work.h
index 681bd3c9..00cc86fe 100644
--- a/src/uvw/work.h
+++ b/src/uvw/work.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef UVW_WORK_INCLUDE_H
+#define UVW_WORK_INCLUDE_H
 
 
 #include <functional>
@@ -63,3 +64,5 @@ private:
 #ifndef UVW_AS_LIB
 #include "work.cpp"
 #endif
+
+#endif // UVW_WORK_INCLUDE_H