diff --git a/src/config-keepassx.h.cmake b/src/config-keepassx.h.cmake
index 21be30be5..298edef84 100644
--- a/src/config-keepassx.h.cmake
+++ b/src/config-keepassx.h.cmake
@@ -1,5 +1,10 @@
 /* config-keepassx.h. Generated by cmake from config-keepassx.h.cmake */
 
+#ifndef KEEPASSX_CONFIG_H
+#define KEEPASSX_CONFIG_H
+
 #define KEEPASSX_VERSION "${KEEPASSX_VERSION}"
 
 #define KEEPASSX_SOURCE_DIR "${CMAKE_SOURCE_DIR}"
+
+#endif // KEEPASSX_CONFIG_H
diff --git a/tests/config-keepassx-tests.h.cmake b/tests/config-keepassx-tests.h.cmake
index 405362d95..b515f5c5f 100644
--- a/tests/config-keepassx-tests.h.cmake
+++ b/tests/config-keepassx-tests.h.cmake
@@ -1,3 +1,8 @@
 /* config-keepassx-tests.h. Generated by cmake from config-keepassx-tests.h.cmake */
 
+#ifndef KEEPASSX_CONFIG_TESTS_H
+#define KEEPASSX_CONFIG_TESTS_H
+
 #define KEEPASSX_TEST_DATA_DIR "${KEEPASSX_TEST_DATA_DIR}"
+
+#endif // KEEPASSX_CONFIG_TESTS_H