diff --git a/tests/color_util.h b/tests/color_util.h
index f822d00a..3e8e2abd 100644
--- a/tests/color_util.h
+++ b/tests/color_util.h
@@ -24,6 +24,8 @@
  * SOFTWARE.
  */
 
+#pragma once
+
 #include <stdint.h>
 #include <stdbool.h>