1 files changed, 1 insertions, 1 deletions
diff --git a/src/rtl/rosc.v b/src/rtl/rosc.v
index 522cac6..59ce3b2 100644
--- a/src/rtl/rosc.v
+++ b/src/rtl/rosc.v
@@ -97,7 +97,7 @@ module rosc #(parameter WIDTH = 2)
       reg             cin;
 
       cin = ~sum[WIDTH];
-      sum = opa + opb + cin;
+      sum = opa + opb + {{(WIDTH - 1){1'b0}}, cin};
       dout_new = sum[WIDTH];
     end
 endmodule // rosc