diff --git a/include/ipfs/util/time.h b/include/ipfs/util/time.h
index b6eec48..ec95eb5 100644
--- a/include/ipfs/util/time.h
+++ b/include/ipfs/util/time.h
@@ -1,5 +1,14 @@
 #ifndef IPFS_TIME_H
     #define IPFS_TIME_H
+    #ifndef __USE_XOPEN
+        #define __USE_XOPEN
+    #endif // __USE_XOPEN
+
+    #ifndef __USE_ISOC11
+        #define __USE_ISOC11
+    #endif // __USE_ISOC11
+
+    #include <time.h>
 
     int ipfs_util_time_parse_RFC3339 (struct timespec *ts, char *s);
     char *ipfs_util_time_format_RFC3339 (struct timespec *ts);
diff --git a/util/time.c b/util/time.c
index 68707fe..3eee8c3 100644
--- a/util/time.c
+++ b/util/time.c
@@ -1,16 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-
-#ifndef __USE_XOPEN
-    #define __USE_XOPEN
-#endif // __USE_XOPEN
-
-#ifndef __USE_ISOC11
-    #define __USE_ISOC11
-#endif // __USE_ISOC11
-
-#include <time.h>
 #include "ipfs/util/time.h"
 
 int ipfs_util_time_parse_RFC3339 (struct timespec *ts, char *s)