diff --git a/backends/jny/jny.cc b/backends/jny/jny.cc
index 752ff6312..5a83c5578 100644
--- a/backends/jny/jny.cc
+++ b/backends/jny/jny.cc
@@ -304,7 +304,7 @@ struct JnyWriter
 
             f << get_string(str);
         } else if ((v.flags & RTLIL::ConstFlags::CONST_FLAG_SIGNED) == RTLIL::ConstFlags::CONST_FLAG_SIGNED) {
-            f << stringf("\"%dsd %d\"", v.size(), v.as_int());
+            f << stringf("\"%dsd %d\"", v.size(), v.as_int(true));
         } else if ((v.flags & RTLIL::ConstFlags::CONST_FLAG_REAL) == RTLIL::ConstFlags::CONST_FLAG_REAL) {
 
         } else {