diff --git a/qtest.c b/qtest.c
index a6858272eb..5aa6636ca8 100644
--- a/qtest.c
+++ b/qtest.c
@@ -240,6 +240,7 @@ static void GCC_FMT_ATTR(2, 3) qtest_sendf(CharBackend *chr,
     va_start(ap, fmt);
     buffer = g_strdup_vprintf(fmt, ap);
     qtest_send(chr, buffer);
+    g_free(buffer);
     va_end(ap);
 }