diff --git a/server/tests/test_display_resolution_changes.c b/server/tests/test_display_resolution_changes.c
index edf7fb2d..ef26ee17 100644
--- a/server/tests/test_display_resolution_changes.c
+++ b/server/tests/test_display_resolution_changes.c
@@ -2,8 +2,8 @@
  * Recreate the primary surface endlessly.
  */
 
-#include <math.h>
 #include <config.h>
+#include <math.h>
 #include <stdlib.h>
 #include "test_display_base.h"