diff --git a/phase/builder_test.go b/phase/builder_test.go
index 045073076..e4f4fa1e7 100644
--- a/phase/builder_test.go
+++ b/phase/builder_test.go
@@ -191,8 +191,6 @@ func testBuilder(t *testing.T, when spec.G, it spec.S) {
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_ARCH=amd64")
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_ARCH_VARIANT=")
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_OS=linux")
-					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_DISTRO_NAME=")
-					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_DISTRO_VERSION=")
 					return buildpack.BuildOutputs{}, nil
 				},
 			)
@@ -205,8 +203,6 @@ func testBuilder(t *testing.T, when spec.G, it spec.S) {
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_ARCH=amd64")
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_ARCH_VARIANT=")
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_OS=linux")
-					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_DISTRO_NAME=")
-					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_DISTRO_VERSION=")
 					return buildpack.BuildOutputs{}, nil
 				})
 
diff --git a/phase/detector_test.go b/phase/detector_test.go
index 6820ef37a..1c0e3be05 100644
--- a/phase/detector_test.go
+++ b/phase/detector_test.go
@@ -223,8 +223,6 @@ func testDetector(t *testing.T, when spec.G, it spec.S) {
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_ARCH=amd64")
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_ARCH_VARIANT=")
 					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_OS=linux")
-					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_DISTRO_NAME=")
-					h.AssertContains(t, inputs.TargetEnv, "CNB_TARGET_DISTRO_VERSION=")
 					return buildpack.DetectOutputs{}
 				})
 
diff --git a/phase/generator_test.go b/phase/generator_test.go
index cd6895bf3..2e4a2fcca 100644
--- a/phase/generator_test.go
+++ b/phase/generator_test.go
@@ -284,8 +284,8 @@ func testGenerator(t *testing.T, when spec.G, it spec.S) {
 							h.AssertContains(t, inputs.TargetEnv,
 								"CNB_TARGET_ARCH=amd64",
 								"CNB_TARGET_ARCH_VARIANT=",
-								"CNB_TARGET_DISTRO_NAME=",
-								"CNB_TARGET_DISTRO_VERSION=",
+								"CNB_TARGET_DISTRO_NAME=ubuntu",
+								"CNB_TARGET_DISTRO_VERSION=22.04",
 								"CNB_TARGET_OS=linux",
 							)
 							return buildpack.GenerateOutputs{Dockerfiles: []buildpack.DockerfileInfo{{ExtensionID: d.Extension.ID,
@@ -296,8 +296,8 @@ func testGenerator(t *testing.T, when spec.G, it spec.S) {
 							h.AssertContains(t, inputs.TargetEnv,
 								"CNB_TARGET_ARCH=amd64",
 								"CNB_TARGET_ARCH_VARIANT=",
-								"CNB_TARGET_DISTRO_NAME=",
-								"CNB_TARGET_DISTRO_VERSION=",
+								"CNB_TARGET_DISTRO_NAME=ubuntu",
+								"CNB_TARGET_DISTRO_VERSION=22.04",
 								"CNB_TARGET_OS=linux",
 							)
 							return buildpack.GenerateOutputs{Dockerfiles: []buildpack.DockerfileInfo{{ExtensionID: d.Extension.ID,
diff --git a/platform/run_image_test.go b/platform/run_image_test.go
index e07f4257b..29cc1a54f 100644
--- a/platform/run_image_test.go
+++ b/platform/run_image_test.go
@@ -211,7 +211,7 @@ func testRunImage(t *testing.T, when spec.G, it spec.S) {
 				t:        t,
 				HasFile:  false,
 			}
-			observed := platform.EnvVarsFor(d, tm, nil)
+			observed := platform.EnvVarsFor(d, tm, &log.Logger{Handler: memory.New()})
 			h.AssertContains(t, observed, "CNB_TARGET_ARCH="+tm.Arch)
 			h.AssertContains(t, observed, "CNB_TARGET_ARCH_VARIANT="+tm.ArchVariant)
 			h.AssertContains(t, observed, "CNB_TARGET_DISTRO_NAME="+tm.Distro.Name)
@@ -221,14 +221,13 @@ func testRunImage(t *testing.T, when spec.G, it spec.S) {
 		})
 
 		it("returns the right thing from /etc/os-release", func() {
-			logr := &log.Logger{Handler: memory.New()}
 			d := &mockDetector{
 				contents: "this is just test contents really",
 				t:        t,
 				HasFile:  true,
 			}
 			tm := files.TargetMetadata{Arch: "pentium", ArchVariant: "mmx", ID: "my-id", OS: "linux", Distro: nil}
-			observed := platform.EnvVarsFor(d, tm, logr)
+			observed := platform.EnvVarsFor(d, tm, &log.Logger{Handler: memory.New()})
 			h.AssertContains(t, observed, "CNB_TARGET_ARCH="+tm.Arch)
 			h.AssertContains(t, observed, "CNB_TARGET_ARCH_VARIANT="+tm.ArchVariant)
 			h.AssertContains(t, observed, "CNB_TARGET_DISTRO_NAME=opensesame")
@@ -244,7 +243,7 @@ func testRunImage(t *testing.T, when spec.G, it spec.S) {
 				t:        t,
 				HasFile:  false,
 			}
-			observed := platform.EnvVarsFor(d, tm, nil)
+			observed := platform.EnvVarsFor(d, tm, &log.Logger{Handler: memory.New()})
 			h.AssertContains(t, observed, "CNB_TARGET_ARCH="+tm.Arch)
 			h.AssertContains(t, observed, "CNB_TARGET_OS="+tm.OS)
 			// note: per the spec only the ID field is optional, so I guess the others should always be set: https://github.com/buildpacks/rfcs/blob/main/text/0096-remove-stacks-mixins.md#runtime-metadata