diff --git a/lib/formdata.c b/lib/formdata.c
index bdca3e770368f2a3c86cca9aa52626cdc0d2fd60..e307a28a5bb6bf8392a7c859243495738a661f0e 100644
--- a/lib/formdata.c
+++ b/lib/formdata.c
@@ -1110,8 +1110,10 @@ static CURLcode formdata_add_filename(const struct curl_httppost *file,
 
     /* filename need be escaped */
     filename_escaped = malloc(strlen(filename)*2+1);
-    if(!filename_escaped)
+    if(!filename_escaped) {
+      free(filebasename);
       return CURLE_OUT_OF_MEMORY;
+    }
     p0 = filename_escaped;
     p1 = filename;
     while(*p1) {