diff --git a/backend_tcl/zint.c b/backend_tcl/zint.c
index 92f9529b..291b4e52 100644
--- a/backend_tcl/zint.c
+++ b/backend_tcl/zint.c
@@ -598,9 +598,9 @@ EXPORT int Zint_Init (Tcl_Interp *interp)
     int * tkFlagPtr;
     /*------------------------------------------------------------------------*/
 #ifdef USE_TCL_STUBS
-    if (Tcl_InitStubs(interp, "8.5", 0) == NULL)
+    if (Tcl_InitStubs(interp, "8.5-", 0) == NULL)
 #else
-    if (Tcl_PkgRequire(interp, "Tcl", "8.5", 0) == NULL)
+    if (Tcl_PkgRequire(interp, "Tcl", "8.5-", 0) == NULL)
 #endif
     {
         return TCL_ERROR;