diff --git a/src/com/xilinx/rapidwright/edif/EDIFNetlist.java b/src/com/xilinx/rapidwright/edif/EDIFNetlist.java
index e43bcacd3..3fadfbaea 100644
--- a/src/com/xilinx/rapidwright/edif/EDIFNetlist.java
+++ b/src/com/xilinx/rapidwright/edif/EDIFNetlist.java
@@ -761,7 +761,7 @@ public List<String> getNetAliases(String netName){
 		for(EDIFPortInst p : an.getNet().getPortInsts()){
 			EDIFHierPortInst absPortInst = new EDIFHierPortInst(an.getHierarchicalInstName(), p);
 			// Checks if cell is primitive or black box
-			boolean isCellPin = p.getCellInst() != null && p.getCellInst().getCellType().getCellInsts().size() == 0;
+			boolean isCellPin = p.getCellInst() != null && p.getCellInst().getCellType().isPrimitive();
 			if(isCellPin){
 				leafCellPins.add(absPortInst);
 			}