diff --git a/src/include/general.h b/src/include/general.h
index 3c927e5..1b1aba1 100644
--- a/src/include/general.h
+++ b/src/include/general.h
@@ -21,8 +21,12 @@
 #ifndef __GENERAL_H
 #define __GENERAL_H
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
+#ifndef _DEFAULT_SOURCE
 #define _DEFAULT_SOURCE
+#endif
 #if !defined(__USE_MINGW_ANSI_STDIO)
 # define __USE_MINGW_ANSI_STDIO 1
 #endif