diff --git a/alib2std/test-src/extensions/StringTest.h b/alib2std/test-src/extensions/StringTest.h
index b74cd437f57fe56359e186fd2019e001a94816e0..75be89adb104f24e24578860f8c901a9aeff1565 100644
--- a/alib2std/test-src/extensions/StringTest.h
+++ b/alib2std/test-src/extensions/StringTest.h
@@ -1,5 +1,5 @@
-#ifndef RANDOM_TEST_H_
-#define RANDOM_TEST_H_
+#ifndef STRING_TEST_H_
+#define STRING_TEST_H_
 
 #include <cppunit/extensions/HelperMacros.h>
 
@@ -23,4 +23,4 @@ public:
   void testToString();
 };
 
-#endif  // RANDOM_TEST_H_
+#endif  // STRING_TEST_H_