diff --git a/litex/boards/targets/nexys4ddr.py b/litex/boards/targets/nexys4ddr.py
index 161c11f2b..30174113b 100755
--- a/litex/boards/targets/nexys4ddr.py
+++ b/litex/boards/targets/nexys4ddr.py
@@ -104,7 +104,7 @@ def main():
     soc = BaseSoC(sys_clk_freq=int(float(args.sys_clk_freq)),
         with_ethernet=args.with_ethernet,
         **soc_sdram_argdict(args))
-    assert not (args.with_spi_sdcard and args.with_spi_sdcard)
+    assert not (args.with_spi_sdcard and args.with_sdcard)
     if args.with_spi_sdcard:
         soc.add_spi_sdcard()
     if args.with_sdcard: