diff --git a/common/spartan2.c b/common/spartan2.c
index 0fb23b6..06550b9 100644
--- a/common/spartan2.c
+++ b/common/spartan2.c
@@ -516,7 +516,7 @@
 				(*fn->clk) (FALSE, TRUE, cookie);
 				CONFIG_FPGA_DELAY ();
 				/* Write data */
-				(*fn->wr) ((val < 0), TRUE, cookie);
+				(*fn->wr) ((val & 0x80), TRUE, cookie);
 				CONFIG_FPGA_DELAY ();
 				/* Assert the clock */
 				(*fn->clk) (TRUE, TRUE, cookie);