diff --git a/doc/doxygen/src/css/riot.css b/doc/doxygen/src/css/riot.css
index d84883e7c5..85e65fde97 100644
--- a/doc/doxygen/src/css/riot.css
+++ b/doc/doxygen/src/css/riot.css
@@ -516,3 +516,6 @@ dl.todo > dt {
   background-color: #f5f5f5;
   padding: 4px 6px;
 }
+table.retval > tbody > tr > td.paramname {
+  padding-right: 2em;
+}
diff --git a/doc/doxygen/src/css/riot.less b/doc/doxygen/src/css/riot.less
index 257d90687a..6ce63d24f2 100644
--- a/doc/doxygen/src/css/riot.less
+++ b/doc/doxygen/src/css/riot.less
@@ -458,3 +458,6 @@ dl.todo > dt {
   background-color: @well-bg;
   padding: 4px 6px;
 }
+table.retval > tbody > tr > td.paramname {
+  padding-right: 2em;
+}