diff --git a/libc/tzcode/strftime.c b/libc/tzcode/strftime.c
index a2cc3b3..f6e7435 100644
--- a/libc/tzcode/strftime.c
+++ b/libc/tzcode/strftime.c
@@ -38,6 +38,7 @@
 #include "locale.h"
 #include <ctype.h>
 #include <time64.h>
+#include <bionic_time.h>  /* for strftime_tz */
 
 /* struct lc_time_T is now defined as strftime_locale
  * in <time.h>