diff --git a/passes/opt/muxpack.cc b/passes/opt/muxpack.cc
index 55b1f5bcb..40f01a97e 100644
--- a/passes/opt/muxpack.cc
+++ b/passes/opt/muxpack.cc
@@ -293,7 +293,7 @@ struct MuxpackWorker
       /*   We create the following one-hot select line decoder
             S0           S1             S2                S3   ...
             |            |              |                 |
-            +--------+   +----------+		+-------------+   |
+            +--------+   +----------+   +-------------+   |
             |       _|_  |         _|_  |            _|_  |
             |       \_/  |         \_/  |            \_/  |
             |        o   |          o   |             o   |
@@ -303,7 +303,7 @@ struct MuxpackWorker
             |        |___|      \ & /  /    /     \ & /  /     ...
             |        \ & /       \_/  /    /       \_/  /     / 
             |         \_/         |   |   /         |   |    /
-            |          |	        +------/          +-------/   
+            |          |          +------/          +-------/   
             |          |          |   |             |   |
             |          |          |___|             |___|
             |          |          \ & /             \ & /