diff --git a/common/status.h b/common/status.h
index 1d6597b..0f44f62 100644
--- a/common/status.h
+++ b/common/status.h
@@ -9,6 +9,7 @@
 #ifndef COMMON_STATUS_H_
 #define COMMON_STATUS_H_
 
+#include <iosfwd>
 #include <string>
 
 #include "util/error_space.h"
diff --git a/common/string_util.cc b/common/string_util.cc
index 84031bb..1db23e6 100644
--- a/common/string_util.cc
+++ b/common/string_util.cc
@@ -9,8 +9,10 @@
 #include "common/string_util.h"
 
 #include <bitset>
+#include <cstddef>
 #include <sstream>
 #include <string>
+
 #include "common/status.h"
 
 namespace widevine {