diff --git a/furi/core/thread_i.h b/furi/core/thread_i.h
index 2760d6a26..c3289f7ad 100644
--- a/furi/core/thread_i.h
+++ b/furi/core/thread_i.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "thread.h"
+#include "string.h"
 
 typedef struct {
     FuriThreadStdoutWriteCallback write_callback;