diff --git a/lib/transfer.c b/lib/transfer.c
index f9cdcd1d81..c0e87f708d 100644
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -435,7 +435,7 @@ CURLcode Curl_readrewind(struct Curl_easy *data)
     ; /* do nothing */
   else if(data->state.httpreq == HTTPREQ_POST_MIME ||
           data->state.httpreq == HTTPREQ_POST_FORM) {
-    if(Curl_mime_rewind(mimepart)) {
+    if(Curl_mime_rewind(mimepart) != CURLE_OK) {
       failf(data, "Cannot rewind mime/post data");
       return CURLE_SEND_FAIL_REWIND;
     }