diff --git a/simgear/io/untar.hxx b/simgear/io/untar.hxx
index 254d8548..0da06b20 100644
--- a/simgear/io/untar.hxx
+++ b/simgear/io/untar.hxx
@@ -21,6 +21,7 @@
 #include <memory>
 
 #include <cstdlib>
+#include <stdint.h> // for uint8_t
 #include <simgear/misc/sg_path.hxx>
 
 namespace simgear