diff --git a/simgear/props/props.cxx b/simgear/props/props.cxx
index 2f26f2a6..976ba30d 100644
--- a/simgear/props/props.cxx
+++ b/simgear/props/props.cxx
@@ -574,6 +574,7 @@ SGPropertyNode::make_string () const
   case DOUBLE:
     {
       stringstream sstr;
+      sstr.precision( 10 );
       sstr << get_double();
       _buffer = sstr.str();
       return _buffer.c_str();