diff --git a/configure.in b/configure.in
index 5660e9b3c..f24effe5b 100644
--- a/configure.in
+++ b/configure.in
@@ -1,7 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_INIT(README)
 AC_CONFIG_HEADER(include/SDL_config.h)
-AC_GNU_SOURCE
 AC_CONFIG_AUX_DIR(build-scripts)
 AC_CONFIG_MACRO_DIR([acinclude])