diff --git a/fly/commands/internal/flaghelpers/json_flag.go b/fly/commands/internal/flaghelpers/json_flag.go
deleted file mode 100644
index 34ebeeba3..000000000
--- a/fly/commands/internal/flaghelpers/json_flag.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package flaghelpers
-
-import (
-	"encoding/json"
-)
-
-type JsonFlag struct {
-	Raw   string
-	Value map[string]string
-}
-
-func (v *JsonFlag) UnmarshalFlag(value string) error {
-	err := json.Unmarshal([]byte(value), &v.Value)
-	if err != nil {
-		return err
-	}
-
-	v.Raw = value
-
-	return nil
-}
diff --git a/fly/commands/internal/flaghelpers/json_flag_test.go b/fly/commands/internal/flaghelpers/json_flag_test.go
deleted file mode 100644
index 7e3c94e66..000000000
--- a/fly/commands/internal/flaghelpers/json_flag_test.go
+++ /dev/null
@@ -1,30 +0,0 @@
-package flaghelpers_test
-
-import (
-	. "github.com/concourse/concourse/fly/commands/internal/flaghelpers"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-)
-
-var _ = Describe("JsonFlag", func() {
-	Context("when JSON string is invalid", func() {
-		It("displays an error message", func() {
-			jsonFlag := &JsonFlag{}
-
-			err := jsonFlag.UnmarshalFlag("{some:value}")
-			Expect(err).To(MatchError("invalid character 's' looking for beginning of object key string"))
-		})
-	})
-
-	Context("when JSON string is valid", func() {
-		It("parse the JSON into version", func() {
-			jsonFlag := &JsonFlag{}
-
-			err := jsonFlag.UnmarshalFlag(`{"some":"value"}`)
-			Expect(err).ToNot(HaveOccurred())
-			Expect(jsonFlag.Value).To(Equal(map[string]string{"some": "value"}))
-			Expect(jsonFlag.Raw).To(Equal(`{"some":"value"}`))
-		})
-	})
-})
diff --git a/go-concourse/concourse/resourceversions_test.go b/go-concourse/concourse/resourceversions_test.go
index d719749ce..c6459ba9b 100644
--- a/go-concourse/concourse/resourceversions_test.go
+++ b/go-concourse/concourse/resourceversions_test.go
@@ -158,11 +158,11 @@ var _ = Describe("ATC Handler Resource Versions", func() {
 
 		Context("when filter is specified", func() {
 			BeforeEach(func() {
-				filter = atc.Version{"some": "value", "some-other": "other-value"}
+				filter = atc.Version{"some": "value"}
 
 				atcServer.AppendHandlers(
 					ghttp.CombineHandlers(
-						ghttp.VerifyRequest("GET", expectedURL, "filter=some:value&filter=some-other:other-value"),
+						ghttp.VerifyRequest("GET", expectedURL, "filter=some:value"),
 						ghttp.RespondWithJSONEncoded(http.StatusOK, expectedVersions),
 					),
 				)