diff --git a/helpers/lh_config b/helpers/lh_config
index d0c436295..ef5b5063b 100755
--- a/helpers/lh_config
+++ b/helpers/lh_config
@@ -205,7 +205,7 @@ Local_arguments ()
 				;;
 
 			--apt-pdiffs)
-				APT_PDIFFS="${2}"
+				LH_APT_PDIFFS="${2}"
 				shift 2
 				;;
 			--apt-options)