diff --git a/src/libiso8601/000_TopSource.c b/src/libiso8601/000_TopSource.c
index 3e430bf..087d455 100644
--- a/src/libiso8601/000_TopSource.c
+++ b/src/libiso8601/000_TopSource.c
@@ -13,6 +13,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/time.h>
 
 /* Useful define to alleviate typos */
 #define BILLION (1000000000L)