diff --git a/src/uvw/tcp.hpp b/src/uvw/tcp.hpp
index f233d8ac..72cfc4ff 100644
--- a/src/uvw/tcp.hpp
+++ b/src/uvw/tcp.hpp
@@ -219,7 +219,7 @@ public:
 
 private:
     enum { DEFAULT, FLAGS } tag{DEFAULT};
-    unsigned int flags;
+    unsigned int flags{};
 };
 
 
diff --git a/src/uvw/udp.hpp b/src/uvw/udp.hpp
index ba801b20..5777af8e 100644
--- a/src/uvw/udp.hpp
+++ b/src/uvw/udp.hpp
@@ -370,7 +370,7 @@ public:
 
 private:
     enum { DEFAULT, FLAGS } tag{DEFAULT};
-    unsigned int flags;
+    unsigned int flags{};
 };