diff --git a/tutorials/ReverseDebug/main.c b/tutorials/ReverseDebug/main.c
index 5ae18901b..d730ec0f3 100644
--- a/tutorials/ReverseDebug/main.c
+++ b/tutorials/ReverseDebug/main.c
@@ -17,6 +17,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #define ARRAY_LENGTH 10