diff --git a/doc/theme/css/custom.css b/doc/theme/css/custom.css
index f1dcf0a0fa9dc8e2aa1329cacb7ade2d76da8b88..e178af6d963b67d5be59e3eeb9a4a390ae437132 100644
--- a/doc/theme/css/custom.css
+++ b/doc/theme/css/custom.css
@@ -83,3 +83,12 @@ span[id*="MathJax-Span"] {
 	font-size: 116%;
 }
 
+/* Hide permalinks on captions */
+caption a.headerlink {
+	visibility: hidden;
+}
+
+caption:hover a.headerlink {
+	visibility: visible;
+}
+