diff --git a/jerry-ext/debugger/debugger-tcp.c b/jerry-ext/debugger/debugger-tcp.c
index 31f8d4699..8b00ae65e 100644
--- a/jerry-ext/debugger/debugger-tcp.c
+++ b/jerry-ext/debugger/debugger-tcp.c
@@ -23,6 +23,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <sys/socket.h>
 
 /**
  * Implementation of transport over tcp/ip.