diff --git a/http.c b/http.c
index 217a6dc5..2b98674f 100644
--- a/http.c
+++ b/http.c
@@ -80,6 +80,7 @@
 #include <fcntl.h>
 #endif
 #ifdef HAVE_FNMATCH_H
+#define _GNU_SOURCE
 #include <fnmatch.h>
 #endif