diff --git a/nixos/doc/manual/Makefile b/nixos/doc/manual/Makefile
index 5cbbf140869..2e9adf70c39 100644
--- a/nixos/doc/manual/Makefile
+++ b/nixos/doc/manual/Makefile
@@ -11,7 +11,7 @@ manual-combined.xml: generated *.xml
 
 .PHONY: format
 format:
-	find . -iname '*.xml' -type f -print0 | xargs -0 -I{} -n1 \
+	find ../../ -iname '*.xml' -type f -print0 | xargs -0 -I{} -n1 \
 		xmlformat --config-file "../xmlformat.conf" -i {}
 
 .PHONY: fix-misc-xml