1 files changed, 1 insertions, 1 deletions
diff --git a/mistral/archdefs.h b/mistral/archdefs.h
index 5fd02ad5..60bdcfeb 100644
--- a/mistral/archdefs.h
+++ b/mistral/archdefs.h
@@ -98,7 +98,7 @@ struct WireId
     bool is_nextpnr_created() const
     {
         NPNR_ASSERT(node != invalid_rnode);
-        return CycloneV::rn2t(node) >= 128;
+        return unsigned(CycloneV::rn2t(node)) >= 128;
     }
 
     bool operator==(const WireId &other) const { return node == other.node; }