diff --git a/src/xi/xi.h b/src/xi/xi.h
index e3d3fba6e..72d86b6a2 100755
--- a/src/xi/xi.h
+++ b/src/xi/xi.h
@@ -1434,7 +1434,7 @@ XIDLL  void  xi_set_text XVT_CC_ARGS( ( XI_OBJ * xi_obj, const char *s ) );
 XIDLL  void  xi_set_override_cursor XVT_CC_ARGS( ( XI_OBJ* itf, XinCursor cursor, BOOLEAN flag ) );
 XIDLL  void  xi_event_debug XVT_CC_ARGS( ( char *tag, XI_EVENT * xiev, char *s, int len ) );
 
-XIDLL  char * gstrncpy XVT_CC_ARGS( ( char *dst, char *src, int n ) );
+XIDLL  char * gstrncpy XVT_CC_ARGS( ( char *dst, const char *src, int n ) );
 
   /* XI consistant drawing functions - these functions perform identically on
   * all platforms.  These functions also do virtual interface coordinate