diff --git a/src/debug/tap.sv b/src/debug/tap.sv
index 74ec6ad8e..b76afca8f 100644
--- a/src/debug/tap.sv
+++ b/src/debug/tap.sv
@@ -82,7 +82,7 @@ module tap (
 
   always @(negedge tck) begin
     resetn <= ~(State == TLReset);
-    tdo_en <= State == ShiftIR || State == ShiftDR;
+    tdo_en <= State == ShiftIR | State == ShiftDR;
     captureIR <= State == CaptureIR;
     updateIR <= State == UpdateIR;
     shiftDR <= State == ShiftDR;