diff --git a/usr.bin/dtc/string.hh b/usr.bin/dtc/string.hh
index 45bc4fd..6eaf8e4 100644
--- a/usr.bin/dtc/string.hh
+++ b/usr.bin/dtc/string.hh
@@ -32,6 +32,8 @@
 
 #ifndef _STRING_HH_
 #define _STRING_HH_
+#include <cstdio>
+#include <cstring>
 #include "input_buffer.hh"
 
 namespace dtc
diff --git a/usr.bin/dtc/util.hh b/usr.bin/dtc/util.hh
index 7f2ec67..8e13b1c 100644
--- a/usr.bin/dtc/util.hh
+++ b/usr.bin/dtc/util.hh
@@ -33,6 +33,7 @@
 #ifndef _UTIL_HH_
 #define _UTIL_HH_
 
+#include <stdint.h>
 #include <vector>
 
 // If we aren't using C++11, then just ignore static asserts.