diff --git a/configure.ac b/configure.ac
index 62bbef3f..5ed19e19 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,6 +107,7 @@ AC_ARG_ENABLE(
 )
 
 # Programs
+# pthread_rwlock_t requires _GNU_SOURCE
 AC_GNU_SOURCE
 AC_PROG_CC
 AC_PROG_LIBTOOL
diff --git a/libfuse-lite/fuse.c b/libfuse-lite/fuse.c
index f523cd6f..1820f26b 100644
--- a/libfuse-lite/fuse.c
+++ b/libfuse-lite/fuse.c
@@ -6,10 +6,6 @@
     See the file COPYING.LIB
 */
 
-
-/* For pthread_rwlock_t */
-#define _GNU_SOURCE
-
 #include "config.h"
 #include "fuse_i.h"
 #include "fuse_lowlevel.h"