diff --git a/tufte-handout.cls b/tufte-handout.cls
index 7cc3811..bc35944 100644
--- a/tufte-handout.cls
+++ b/tufte-handout.cls
@@ -105,7 +105,7 @@
 %%
 % To implement full-width display environments
 
-\RequirePackage{chngpage}
+\RequirePackage[strict]{chngpage}
 
 % Compute length used for full-width displays