diff --git a/util/StaConfig.hh.cmake b/util/StaConfig.hh.cmake
index 572588af..78d2e304 100644
--- a/util/StaConfig.hh.cmake
+++ b/util/StaConfig.hh.cmake
@@ -1,3 +1,5 @@
+#pragma once
+
 #define STA_VERSION "${STA_VERSION}"
 
 #define STA_GIT_SHA1 "${STA_GIT_SHA1}"