diff --git a/HsH-classes.dtx b/HsH-classes.dtx
index d650f8512349ae51d5135ca62777376fbbe9304d..35882d96b68b3e6ac9576651a5c7cbe8e05470af 100644
--- a/HsH-classes.dtx
+++ b/HsH-classes.dtx
@@ -621,6 +621,7 @@
   }
 }{}
 \@ifpackageloaded{enumitem}{
+  \RequirePackage{amssymb}
   \newlist{checklist}{itemize}{2}
   \setlist[checklist]{label=$\square$}
 }{}
diff --git a/src/config.tex b/src/config.tex
index 9b9ff9ed5ddf0cee55e4ac68f7d21a4afad34a01..5879e7b2719e27ddc887832c1630c68625279ee8 100644
--- a/src/config.tex
+++ b/src/config.tex
@@ -43,6 +43,7 @@
   }
 }{}
 \@ifpackageloaded{enumitem}{
+  \RequirePackage{amssymb}
   \newlist{checklist}{itemize}{2}
   \setlist[checklist]{label=$\square$}
 }{}