diff --git a/fuzz/driver.c b/fuzz/driver.c
index de515748cefc1137021f02cd7663c4e93c8b62c8..c530fedc844f1ec96823bd44018b13bae6211eb1 100644
--- a/fuzz/driver.c
+++ b/fuzz/driver.c
@@ -9,6 +9,7 @@
  */
 #include <stdint.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <openssl/opensslconf.h>
 #include "fuzzer.h"