diff --git a/tools/regression/usr.bin/make/syntax/directive-t0/Makefile b/tools/regression/usr.bin/make/syntax/directive-t0/Makefile
index 0f95a216116..dedccc37cf5 100644
--- a/tools/regression/usr.bin/make/syntax/directive-t0/Makefile
+++ b/tools/regression/usr.bin/make/syntax/directive-t0/Makefile
@@ -3,6 +3,6 @@
 # A typo'ed directive.
 #
 
-.uudef foo
+.undef foo
 
 all: