diff --git a/ot-recorder.c b/ot-recorder.c
index 87703d7..b81f070 100644
--- a/ot-recorder.c
+++ b/ot-recorder.c
@@ -19,6 +19,7 @@
 #include "safewrite.h"
 #include "base64.h"
 #include "misc.h"
+#include "util.h"
 
 
 #define SSL_VERIFY_PEER (1)
@@ -111,13 +112,6 @@ JsonNode *extract(struct udata *ud, char *payload, char *tid, char *t, double *l
 	return (json);
 }
 
-static const char *isotime(time_t t) {
-	static char buf[] = "YYYY-MM-DDTHH:MM:SSZ";
-
-	strftime(buf, sizeof(buf), "%FT%TZ", gmtime(&t));
-	return(buf);
-}
-
 static const char *ltime(time_t t) {
 	static char buf[] = "HH:MM:SS";