diff --git a/ChangeLog b/ChangeLog
index f09a747515..167bcfa630 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Feb 17 12:31:31 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (get_envparam_double): fix a warning message.
+
 Mon Feb 17 12:09:52 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: introduce new environment variable
diff --git a/gc.c b/gc.c
index 4a814957af..fc85cd4cee 100644
--- a/gc.c
+++ b/gc.c
@@ -5735,7 +5735,7 @@ get_envparam_double(const char *name, double *default_value, double lower_bound)
 	    return 0;
 	}
 	if (val > lower_bound) {
-	    if (RTEST(ruby_verbose)) fprintf(stderr, "%s=%f (%f)\n", name, val, *default_value);
+	    if (RTEST(ruby_verbose)) fprintf(stderr, "%s=%f (default value: %f)\n", name, val, *default_value);
 	    *default_value = val;
 	    return 1;
 	}