diff --git a/ssl/test/test_config.cc b/ssl/test/test_config.cc
index 70543cce..270fbfb5 100644
--- a/ssl/test/test_config.cc
+++ b/ssl/test/test_config.cc
@@ -14,6 +14,7 @@
 
 #include "test_config.h"
 
+#include <stdio.h>
 #include <string.h>
 
 #include <memory>
diff --git a/tool/args.cc b/tool/args.cc
index 1882de0d..6cbfab65 100644
--- a/tool/args.cc
+++ b/tool/args.cc
@@ -16,6 +16,7 @@
 #include <vector>
 #include <map>
 
+#include <stdio.h>
 #include <string.h>
 
 #include "internal.h"
diff --git a/tool/client.cc b/tool/client.cc
index 8aef559a..d7d9e228 100644
--- a/tool/client.cc
+++ b/tool/client.cc
@@ -26,6 +26,7 @@
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <netdb.h>
+#include <netinet/in.h>
 #include <sys/select.h>
 #include <unistd.h>
 #else