diff --git a/Makefile.am b/Makefile.am
index 16cb47cc..b94fdd63 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -339,6 +339,7 @@ libuv_la_SOURCES += src/unix/android-ifaddrs.c \
 endif
 
 if CYGWIN
+include_HEADERS += include/uv-posix.h
 libuv_la_CFLAGS += -D_GNU_SOURCE
 libuv_la_SOURCES += src/unix/cygwin.c \
                     src/unix/bsd-ifaddrs.c \