diff --git a/compat/posix.h b/compat/posix.h
index deefc43f28..980cf68025 100644
--- a/compat/posix.h
+++ b/compat/posix.h
@@ -56,7 +56,7 @@
 #define UNUSED
 #endif
 
-#ifdef __MINGW64__
+#if defined(__MINGW32__) || defined(__MINGW64__)
 #define _POSIX_C_SOURCE 1
 #elif defined(__sun__)
  /*