diff --git a/libs/vfork/exec_wrapper.c b/libs/vfork/exec_wrapper.c
index 4beb7a3b87..8a288f01a1 100644
--- a/libs/vfork/exec_wrapper.c
+++ b/libs/vfork/exec_wrapper.c
@@ -99,3 +99,4 @@ int main(int argc, char *argv[]) {
 	exit(-1);
 	return -1;
 }
+
diff --git a/libs/vfork/wscript b/libs/vfork/wscript
index 1301f215c2..48526d0783 100644
--- a/libs/vfork/wscript
+++ b/libs/vfork/wscript
@@ -24,5 +24,5 @@ def build(bld):
     obj.install_path = os.path.join(bld.env['LIBDIR'], 'ardour3/vfork')
     obj.defines = [
             '_POSIX_SOURCE',
-            '_XOPEN_SOURCE=700',
+            '_XOPEN_SOURCE=500',
     ]