diff --git a/mod/assign/styles.css b/mod/assign/styles.css
index 66bae378059..f3cc290e294 100644
--- a/mod/assign/styles.css
+++ b/mod/assign/styles.css
@@ -199,7 +199,7 @@
 }
 
 .path-mod-assign.jsenabled .expandsummaryicon {
-    display: inline;
+    display: inline-block;
 }
 
 .path-mod-assign .hidefull {