diff --git a/win32/zlib.def b/win32/zlib.def
index 784b138..e858d1e 100644
--- a/win32/zlib.def
+++ b/win32/zlib.def
@@ -1,3 +1,4 @@
+LIBRARY zlib1.dll
 ; zlib data compression library
 EXPORTS
 ; basic functions