diff --git a/lib/libcurl.def b/lib/libcurl.def
index f29ed54141..fac1c1b624 100644
--- a/lib/libcurl.def
+++ b/lib/libcurl.def
@@ -31,4 +31,5 @@ EXPORTS
  	curl_mvfprintf @ 22 ;
 	curl_strequal @ 23 ;
 	curl_strnequal @ 24 ;
+        curl_easy_duphandle @ 25 ;