diff --git a/commands.go b/commands.go
index 0375b2d6..6ba174e3 100644
--- a/commands.go
+++ b/commands.go
@@ -5,7 +5,7 @@ import (
 )
 
 func formatFloat(f float64) string {
-	return strconv.FormatFloat(f, 'f', -1, 32)
+	return strconv.FormatFloat(f, 'f', -1, 64)
 }
 
 //------------------------------------------------------------------------------
diff --git a/redis_test.go b/redis_test.go
index 6102b073..2d611a1a 100644
--- a/redis_test.go
+++ b/redis_test.go
@@ -953,6 +953,12 @@ func (t *RedisTest) TestIncrByFloat(c *C) {
 	c.Assert(incrByFloat.Val(), Equals, float64(5200))
 }
 
+func (t *RedisTest) TestIncrByFloatOverflow(c *C) {
+	incrByFloat := t.client.IncrByFloat("key", 996945661)
+	c.Assert(incrByFloat.Err(), IsNil)
+	c.Assert(incrByFloat.Val(), Equals, float64(996945661))
+}
+
 func (t *RedisTest) TestStringsMSetMGet(c *C) {
 	mSet := t.client.MSet("key1", "hello1", "key2", "hello2")
 	c.Assert(mSet.Err(), IsNil)