diff --git a/ms2130_patch.c b/ms2130_patch.c
index 62d5092..2fd7d07 100644
--- a/ms2130_patch.c
+++ b/ms2130_patch.c
@@ -117,6 +117,7 @@ int main(int argc, char *argv[])
 			goto err;
 		}
 		fclose(fp);
+		fp = NULL;
 	}
 
 	uint16_t code_len = (fw[0x02] << 8) | fw[0x03];