diff --git a/pub/lib/obj.cpp b/pub/lib/obj.cpp
index ee636f94052488b2c1267f436d63a7331c6fb842..4f9abef3ec2d3f3d88e944ed5aa7ae6f64fe9aeb 100644
--- a/pub/lib/obj.cpp
+++ b/pub/lib/obj.cpp
@@ -10,8 +10,10 @@
 #include <string>
 #include <vector>
 #include <cmath>
+#include <boost/format.hpp>
 
 using namespace std;
+using boost::format;
 
 #include "defs.hpp"
 #include "ptr.hpp"
@@ -48,7 +50,9 @@ string CObjInt::to_s( int maxlen, int minlen, int prec ) const
 
 string CObjDbl::to_s( int maxlen, int minlen, int prec ) const
 {
-    return S(val);
+    string form = str( format( "%%#%i.%ig" ) % maxlen % prec );
+    string ret = str( format( form ) % val );
+    return ret;
 }
 
 //! Returns textual representation of the class instance, for debugging.