diff --git a/mongoose.h b/mongoose.h
index 55a964d3..2336eb38 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -467,7 +467,7 @@ FILE *mg_fopen(const char *fp, const char *mode);
 #if !defined(WEAK)
 #if (defined(__GNUC__) || defined(__clang__) || \
      defined(__TI_COMPILER_VERSION__)) &&       \
-    !defined(_WIN32)
+    !defined(_WIN32) && !defined(__CYGWIN__)
 #define WEAK __attribute__((weak))
 #else
 #define WEAK
diff --git a/src/util.h b/src/util.h
index 9b46a1a7..52f243a3 100644
--- a/src/util.h
+++ b/src/util.h
@@ -43,7 +43,7 @@ FILE *mg_fopen(const char *fp, const char *mode);
 #if !defined(WEAK)
 #if (defined(__GNUC__) || defined(__clang__) || \
      defined(__TI_COMPILER_VERSION__)) &&       \
-    !defined(_WIN32)
+    !defined(_WIN32) && !defined(__CYGWIN__)
 #define WEAK __attribute__((weak))
 #else
 #define WEAK