1 files changed, 1 insertions, 1 deletions
diff --git a/ecp5/globals.cc b/ecp5/globals.cc
index 91d224e5..e5627b66 100644
--- a/ecp5/globals.cc
+++ b/ecp5/globals.cc
@@ -52,7 +52,7 @@ class Ecp5GlobalRouter
   private:
     bool is_clock_port(const PortRef &user)
     {
-        if (user.cell->type == id_TRELLIS_SLICE && user.port == id_CLK)
+        if (user.cell->type == id_TRELLIS_SLICE && (user.port == id_CLK || user.port == id_WCK))
             return true;
         return false;
     }