diff --git a/src/utils/nyx_file_io.c b/src/utils/nyx_file_io.c
index 79e19b4..6749ce4 100644
--- a/src/utils/nyx_file_io.c
+++ b/src/utils/nyx_file_io.c
@@ -29,6 +29,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <stdint.h>
+#include <stdlib.h>
 
 #define READ_BUFFER_SIZE 10