use only C style comments

2 files changed, 2 insertions, 2 deletions

diff --git a/mutex.h b/mutex.h
index db44814..ffbdb31 100644
--- a/mutex.h
+++ b/mutex.h
@@ -56,4 +56,4 @@ typedef int thread_status_t;
 #define THREAD_SUCCESS(status)  ((status) == 0)
 #endif
 
-#endif // _H_MUTEX
+#endif /* _H_MUTEX */
diff --git a/vcard_emul.h b/vcard_emul.h
index 5df01a8..05fb57e 100644
--- a/vcard_emul.h
+++ b/vcard_emul.h
@@ -20,7 +20,7 @@
 typedef enum {
     VCARD_EMUL_OK =0,
     VCARD_EMUL_FAIL,
-    // return values by vcard_emul_init
+    /* return values by vcard_emul_init */
     VCARD_EMUL_INIT_ALREADY_INITED,
 } VCardEmulError;