diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
index 4bd761d72b6f3e0758a7648d6fd188958710e606..f37c98cff9aab3601891a32181fff1fd9b889c65 100644
--- a/src/qemu/qemu_monitor_text.c
+++ b/src/qemu/qemu_monitor_text.c
@@ -1081,7 +1081,7 @@ int qemuMonitorTextChangeMedia(qemuMonitorPtr mon,
     /* If the command failed qemu prints:
      * device not found, device is locked ...
      * No message is printed on success it seems */
-    if (strstr(reply, "device ")) {
+    if (c_strcasestr(reply, "device ")) {
         qemuReportError(VIR_ERR_OPERATION_FAILED,
                         _("could not change media on %s: %s"), devname, reply);
         goto cleanup;