diff --git a/hw/usb/desc-msos.c b/hw/usb/desc-msos.c
index 334d1aea8d..32c3600df8 100644
--- a/hw/usb/desc-msos.c
+++ b/hw/usb/desc-msos.c
@@ -231,7 +231,7 @@ int usb_desc_msos(const USBDesc *desc,  USBPacket *p,
         length = len;
     }
     memcpy(dest, buf, length);
-    free(buf);
+    g_free(buf);
 
     p->actual_length = length;
     return 0;