diff --git a/src/com/xilinx/rapidwright/examples/PolynomialGenerator.java b/src/com/xilinx/rapidwright/examples/PolynomialGenerator.java
index f68c2730f..32d23667b 100644
--- a/src/com/xilinx/rapidwright/examples/PolynomialGenerator.java
+++ b/src/com/xilinx/rapidwright/examples/PolynomialGenerator.java
@@ -34,7 +34,6 @@
 import com.xilinx.rapidwright.design.Design;
 import com.xilinx.rapidwright.design.Module;
 import com.xilinx.rapidwright.design.ModuleInst;
-import com.xilinx.rapidwright.design.Net;
 import com.xilinx.rapidwright.design.NetType;
 import com.xilinx.rapidwright.design.SiteInst;
 import com.xilinx.rapidwright.design.blocks.PBlock;
@@ -395,6 +394,7 @@ public static Design generatePolynomial(String polynomial, String name, int widt
 
         if (route) {
             t.stop().start("RWRoute");
+            d.flattenDesign();
             RWRoute.routeDesignFullNonTimingDriven(d);
         }