diff --git a/common/simpcfg.hpp b/common/simpcfg.hpp
index 587b9dbb0..7346087bb 100644
--- a/common/simpcfg.hpp
+++ b/common/simpcfg.hpp
@@ -94,7 +94,7 @@ public:
     void set_double(const std::string &group, const std::string &key, double value) {
         auto &gm = mapDoubles[group];
         gm[key] = value;
-        LDBUG_LN("DBUG:SC:%s:%s:%s:%f", __func__, group.c_str(), key.c_str(), value);
+        LDBUG_LN("DBUG:SC:%s:%s:%s:%f[%e]", __func__, group.c_str(), key.c_str(), value, value);
     }
 
     void set_double(const std::string &group, const std::string &key, std::string &value) {
diff --git a/examples/chaton_meta.simpcfg b/examples/chaton_meta.simpcfg
index 1a3b2dcaa..c8c0cb49b 100644
--- a/examples/chaton_meta.simpcfg
+++ b/examples/chaton_meta.simpcfg
@@ -228,5 +228,6 @@
 	"sint": 	-9876543210
 	"float": 	12.34
 	"double1": 	+12.0e-123
-	"double2": 	-12.0e-123
+	"double2": 	-12.0e-123678
+	"double3": 	-12.0e300