diff --git a/lib/strftime.c b/lib/strftime.c
index 5d11f53c3..64c076465 100644
--- a/lib/strftime.c
+++ b/lib/strftime.c
@@ -47,7 +47,7 @@
 # endif
 #endif
 
-#if HAVE_TZNAME
+#if HAVE_TZNAME || defined __LIBC
 extern char *tzname[];
 #endif