diff --git a/src/influx.c b/src/influx.c
index 2bc705a..a7b3f67 100644
--- a/src/influx.c
+++ b/src/influx.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <curl/curl.h>
 #include <time.h>
 #include <string.h>