diff --git a/src/ieu/alu.sv b/src/ieu/alu.sv
index 7b381a0f..ddead973 100644
--- a/src/ieu/alu.sv
+++ b/src/ieu/alu.sv
@@ -80,9 +80,9 @@ module alu #(parameter WIDTH=32) (
   if (`ZBB_SUPPORTED)
     always_comb begin
       case ({Funct7,Funct3})
-        10'b0100000_111: InvB = 1'b1;                                   //andn
-        10'b0100000_110: InvB = 1'b1;                                   //orn
-        10'b0100000_100: InvB = 1'b1;                                   //xnor
+        10'b0100000_111: InvB = 1'b0;                                   //andn
+        10'b0100000_110: InvB = 1'b0;                                   //orn
+        10'b0100000_100: InvB = 1'b0;                                   //xnor
         default: InvB = 1'b0;
       endcase