diff --git a/src/fns.c b/src/fns.c
index 925d1c965f2..404f9976544 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -24,6 +24,7 @@ Boston, MA 02111-1307, USA.  */
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#include <time.h>
 
 /* Note on some machines this defines `vector' as a typedef,
    so make sure we don't use that name in this file.  */