diff --git a/mmcutils/mmcutils.c b/mmcutils/mmcutils.c
index f9c7b70..6d976b5 100644
--- a/mmcutils/mmcutils.c
+++ b/mmcutils/mmcutils.c
@@ -458,7 +458,7 @@
         }
     }
 
-    fsync(out);
+    fsync(fileno(out));
     ret = 0;
 ERROR1:
     fclose ( out );
@@ -509,7 +509,7 @@
         }
     }
 
-    fsync(out);
+    fsync(fileno(out));
     ret = 0;
 ERROR1:
     fclose ( out );