diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index d1ffe87..a49d24f 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -115,6 +115,7 @@
 extern int setupterm(char *,int,int *);
 #ifdef sgi
 extern char *tigetstr(char *);
+extern char *tparm(char *instring, ...);
 #endif
 
 #if defined(sgi) || defined(__sun__)