diff --git a/cpp_faster_fifo/cpp_lib/faster_fifo.cpp b/cpp_faster_fifo/cpp_lib/faster_fifo.cpp
index 48408e6..0ea6f2e 100644
--- a/cpp_faster_fifo/cpp_lib/faster_fifo.cpp
+++ b/cpp_faster_fifo/cpp_lib/faster_fifo.cpp
@@ -1,6 +1,7 @@
 #include <mutex>
 #include <cassert>
 #include <cstring>
+#include <cstdio>
 
 #include <pthread.h>
 #include <sys/time.h>