diff --git a/testsuites/unittest/posix/src/posix_test.h b/testsuites/unittest/posix/src/posix_test.h
index 92c2b833..34bdb11c 100644
--- a/testsuites/unittest/posix/src/posix_test.h
+++ b/testsuites/unittest/posix/src/posix_test.h
@@ -76,7 +76,7 @@
 void ItSuitePosix(void);
 
 extern void ItSuitePosixPthread(void);
-extern void ItSuitePosixMutex(void);            
+extern void ItSuitePosixMutex(void);
 extern void PosixCtypeFuncTest(void);
 extern void PosixIsdigitFuncTest(void);
 extern void PosixIslowerFuncTest(void);