diff --git a/src/system_wrappers/source/data_log_c_helpers_unittest.c b/src/system_wrappers/source/data_log_c_helpers_unittest.c
index 64be6f1b31..e78a0e3563 100644
--- a/src/system_wrappers/source/data_log_c_helpers_unittest.c
+++ b/src/system_wrappers/source/data_log_c_helpers_unittest.c
@@ -12,6 +12,7 @@
 
 #include <assert.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "system_wrappers/interface/data_log_c.h"