diff --git a/cmdline/mktest.c b/cmdline/mktest.c
index fd3893dd..a7eca327 100644
--- a/cmdline/mktest.c
+++ b/cmdline/mktest.c
@@ -364,6 +364,8 @@ void damage(const char* path, int size)
 			/* LCOV_EXCL_STOP */
 		}
 
+		free(data);
+
 		/* flush changes before restoring the time */
 		fflush(f);