diff --git a/Makefile.in b/Makefile.in
index bbe989aa..1d7d87d2 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -79,6 +79,6 @@ update-typedefs:
 
 # Indents projects sources.
 indent:
-	pgindent --typedefs=typedefs-full.list --exclude=pgindent_exclude .
+	pgindent --typedefs=typedefs-full.list --excludes=pgindent_excludes .
 
 .PHONY: update-typedefs indent
diff --git a/pgindent_exclude b/pgindent_excludes
similarity index 100%
rename from pgindent_exclude
rename to pgindent_excludes