diff --git a/techlibs/xilinx/cells.box b/techlibs/xilinx/cells.box
index c8092db6e..c236d3c90 100644
--- a/techlibs/xilinx/cells.box
+++ b/techlibs/xilinx/cells.box
@@ -4,10 +4,10 @@
 # F7BMUX slower than F7AMUX
 # Inputs: 0 1 S0
 # Outputs: OUT
-F7BMUX 1 0 3 1
+F7BMUX 1 1 3 1
 217 223 296
 
 # Inputs: 0 1 S0
 # Outputs: OUT
-MUXF8 2 0 3 1
+MUXF8 2 1 3 1
 104 94 273