diff --git a/shdoc b/shdoc
index 013da72..5fbdad3 100755
--- a/shdoc
+++ b/shdoc
@@ -178,6 +178,7 @@ function render_toc_link(text) {
       # @see https://github.com/jch/html-pipeline/blob/master/lib/html/pipeline/toc_filter.rb#L44-L45
       url = tolower(url)
       gsub(/[^[:alnum:] _-]/, "", url)
+      gsub(/_/, "", url)
       gsub(/ /, "-", url)
     }
 
diff --git a/tests/testcases/table-of-contents.test.sh b/tests/testcases/table-of-contents.test.sh
index 9c2893e..b4e0180 100644
--- a/tests/testcases/table-of-contents.test.sh
+++ b/tests/testcases/table-of-contents.test.sh
@@ -20,7 +20,7 @@ tests:put expected <<EOF
 ## Index
 
 * [some:first:func](#somefirstfunc)
-* [some_other_func](#some_other_func)
+* [some_other_func](#someotherfunc)
 
 ### some:first:func