diff --git a/simgear/misc/props.cxx b/simgear/misc/props.cxx
index d9a861e4..8ff66ca01 100644
--- a/simgear/misc/props.cxx
+++ b/simgear/misc/props.cxx
@@ -19,10 +19,13 @@ using std::sort;
 
 #include <simgear/compiler.h>
 #include <simgear/debug/logstream.hxx>
+
 SG_USING_STD(sort);
 
 #endif
 
+#include <algorithm>
+#include <stdio.h>
 #include <string.h>