diff --git a/usr.bin/diff/diffreg.c b/usr.bin/diff/diffreg.c
index f4199a44976..c9b8edf6e02 100644
--- a/usr.bin/diff/diffreg.c
+++ b/usr.bin/diff/diffreg.c
@@ -440,6 +440,7 @@ diffreg(char *file1, char *file2, int flags, int capsicum)
 				err(2, "unable to limit stdio");
 
 		caph_cache_catpages();
+		caph_cache_tzdata();
 		if (cap_enter() < 0 && errno != ENOSYS)
 			err(2, "unable to enter capability mode");
 	}