diff --git a/tests/qtest/hd-geo-test.c b/tests/qtest/hd-geo-test.c
index f7b7cfbc2d..113126ae06 100644
--- a/tests/qtest/hd-geo-test.c
+++ b/tests/qtest/hd-geo-test.c
@@ -464,7 +464,7 @@ static char *create_qcow2_with_mbr(MBRpartitions mbr, uint64_t sectors)
     }
 
     fd = mkstemp(raw_path);
-    g_assert(fd);
+    g_assert(fd >= 0);
     close(fd);
 
     fd = open(raw_path, O_WRONLY);
@@ -474,7 +474,7 @@ static char *create_qcow2_with_mbr(MBRpartitions mbr, uint64_t sectors)
     close(fd);
 
     fd = mkstemp(qcow2_path);
-    g_assert(fd);
+    g_assert(fd >= 0);
     close(fd);
 
     qemu_img_path = getenv("QTEST_QEMU_IMG");