diff --git a/examples/helloworld_ecp5.nix b/examples/helloworld_ecp5.nix
index 52e9283..151ef85 100644
--- a/examples/helloworld_ecp5.nix
+++ b/examples/helloworld_ecp5.nix
@@ -13,7 +13,7 @@ let
     cat > $out/top.lpf << EOF
     LOCATE COMP "clk100" SITE "P3";
     IOBUF PORT "clk100" IO_TYPE=LVDS;
-    LOCATE COMP "serial_tx" SITE "C11";
+    LOCATE COMP "serial_tx" SITE "A11";
     IOBUF PORT "serial_tx" IO_TYPE=LVCMOS33;
     EOF