diff --git a/lib/layouts/amsart.layout b/lib/layouts/amsart.layout
index fdf304cb55..f133008d6f 100644
--- a/lib/layouts/amsart.layout
+++ b/lib/layouts/amsart.layout
@@ -19,7 +19,7 @@ ClassOptions
 	FontSize   8|9|10|11|12
 End
 
-UseModule theorems-ams
+DefaultModule theorems-ams
 
 Style Standard
 	Category              MainText
diff --git a/lib/layouts/amsbook.layout b/lib/layouts/amsbook.layout
index 3253cf7c77..d6ea1d78dd 100644
--- a/lib/layouts/amsbook.layout
+++ b/lib/layouts/amsbook.layout
@@ -20,7 +20,7 @@ ClassOptions
 	FontSize   8|9|10|11|12
 End
 
-UseModule theorems-ams
+DefaultModule theorems-ams
 
 Style Standard
 	Category              MainText