diff --git a/src/event_stream.c b/src/event_stream.c
index 276cfd84..e177cc89 100644
--- a/src/event_stream.c
+++ b/src/event_stream.c
@@ -11,6 +11,7 @@
 #endif
 
 #include <stdbool.h>
+#include <stdlib.h>
 #include <string.h>
 #include <igloo/typedef.h>
 #include "icecasttypes.h"