diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 006679eb1..c66e1d750 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -208,6 +208,9 @@ struct SynthXilinxPass : public ScriptPass
 				ise = true;
 				continue;
 			}
+			if (args[argidx] == "-iopad") {
+				continue;
+			}			
 			if (args[argidx] == "-noiopad") {
 				noiopad = true;
 				continue;