diff --git a/extra/rediscmd/rediscmd.go b/extra/rediscmd/rediscmd.go
index 6423b6abd..ff0984624 100644
--- a/extra/rediscmd/rediscmd.go
+++ b/extra/rediscmd/rediscmd.go
@@ -127,5 +127,5 @@ func isSimple(b []byte) bool {
 }
 
 func isSimpleByte(c byte) bool {
-	return c >= 0x21 && c <= 0x7e
+	return c >= 0x20 && c <= 0x7e
 }
diff --git a/extra/rediscmd/rediscmd_test.go b/extra/rediscmd/rediscmd_test.go
index 2219ab0f2..1e358e90d 100644
--- a/extra/rediscmd/rediscmd_test.go
+++ b/extra/rediscmd/rediscmd_test.go
@@ -23,6 +23,7 @@ var _ = Describe("AppendArg", func() {
 		Entry("", "+inf", "+inf"),
 		Entry("", "foo.bar", "foo.bar"),
 		Entry("", "foo:bar", "foo:bar"),
+		Entry("", "foo bar", "foo bar"),
 		Entry("", "foo{bar}", "foo{bar}"),
 		Entry("", "foo-123_BAR", "foo-123_BAR"),
 		Entry("", "foo\nbar", "666f6f0a626172"),