diff --git a/common/jack/systemdeps.h b/common/jack/systemdeps.h
index af4a1755..b4a14720 100644
--- a/common/jack/systemdeps.h
+++ b/common/jack/systemdeps.h
@@ -52,9 +52,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
         #else
             #define PRE_PACKED_STRUCTURE
             #define POST_PACKED_STRUCTURE
-        #endif
+        #endif /* _MSC_VER */
 
-    #endif
+    #endif /* __GNUC__ */
 
 #endif
 
@@ -101,7 +101,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
         typedef pthread_t jack_native_thread_t;
     #endif
 
-#endif // WIN32 && !__CYGWIN__ && !GNU_WIN32 */
+#endif /* WIN32 && !__CYGWIN__ && !GNU_WIN32 */
 
 #if defined(__APPLE__) || defined(__linux__) || defined(__sun__) || defined(sun) || defined(__unix__) || defined(__CYGWIN__) || defined(GNU_WIN32)
 
@@ -118,11 +118,11 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
          */
         typedef pthread_t jack_native_thread_t;
 
-    #endif /* __APPLE__ || __linux__ || __sun__ || sun */
+#endif /* __APPLE__ || __linux__ || __sun__ || sun */
 
 #if defined(__arm__)
     #undef POST_PACKED_STRUCTURE
     #define POST_PACKED_STRUCTURE
 #endif /* __arm__ */
 
-#endif
+#endif /* __jack_systemdeps_h__ */