diff --git a/Modules/parsermodule.c b/Modules/parsermodule.c
index 6c885dfbe54..75b929beb08 100644
--- a/Modules/parsermodule.c
+++ b/Modules/parsermodule.c
@@ -26,6 +26,9 @@
 					/* ISTERMINAL() / ISNONTERMINAL() */
 #include "compile.h"			/* PyNode_Compile()		  */
 
+#ifndef MS_WINDOWS
+char *strdup();
+#endif
 
 /*  String constants used to initialize module attributes.
  *