diff --git a/src/disk.c b/src/disk.c
index f8a51f8..956d67b 100644
--- a/src/disk.c
+++ b/src/disk.c
@@ -19,6 +19,7 @@
 #include <fcntl.h>
 #include <libgen.h>
 #include <unistd.h>
+#include <stdlib.h>
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/src/operations.c b/src/operations.c
index 59bf212..2d26ad5 100644
--- a/src/operations.c
+++ b/src/operations.c
@@ -17,6 +17,8 @@
 
 */
 
+#include <stdlib.h>
+
 #include "global.h"
 #include "device.h"
 #include "usb-device.h"