diff --git a/simgear/debug/logstream.hxx b/simgear/debug/logstream.hxx
index fa9dd9fc..c2a5edc5 100644
--- a/simgear/debug/logstream.hxx
+++ b/simgear/debug/logstream.hxx
@@ -33,6 +33,7 @@
 
 #include <streambuf>
 #include <ostream>
+#include <cstdio>
 
 #include <simgear/debug/debug_types.h>