diff --git a/tools/update_html b/tools/update_html
index 42d977ff..78a790aa 100755
--- a/tools/update_html
+++ b/tools/update_html
@@ -60,7 +60,7 @@ done
 )
 for f in shell/*.mu
 do
-  test $# -gt 0  &&  test $1 != shell/$f  &&  continue
+  test $# -gt 0  &&  test $1 != $f  &&  continue
   process $f
 done
 
@@ -69,7 +69,7 @@ done
 )
 for f in browse-slack/*.mu
 do
-  test $# -gt 0  &&  test $1 != browse-slack/$f  &&  continue
+  test $# -gt 0  &&  test $1 != $f  &&  continue
   process $f
 done