diff --git a/ChangeLog b/ChangeLog
index 67b5d69b1..a597817a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-09-22 Riccardo Mottola <rm@gnu.org>
+
+	* Headers\GNUstepBase\GSBlocks.h
+	Do not enable weak on mingw, because it works only with ELF.
+
 2015-09-18 Riccardo Mottola <rm@gnu.org>
 
 	* Headers/Foundation/NSError.h
diff --git a/Headers/GNUstepBase/GSBlocks.h b/Headers/GNUstepBase/GSBlocks.h
index 0aeeb165a..b8732a11d 100644
--- a/Headers/GNUstepBase/GSBlocks.h
+++ b/Headers/GNUstepBase/GSBlocks.h
@@ -117,9 +117,14 @@ extern "C" {
  * by an application.
  */
 
+/* weak attributed supported only with ELF, MINGW is COFF */
+#ifndef __MINGW32__
+
 void *_Block_copy(void *) __attribute__((weak));
 void _Block_release(void *) __attribute__((weak));
 
+#endif /* __MINGW32__ */
+
 #ifdef __cplusplus
 }
 #endif