diff --git a/cmd/genconfig.go b/cmd/genconfig.go
index cb994627..a7b5af3a 100644
--- a/cmd/genconfig.go
+++ b/cmd/genconfig.go
@@ -55,7 +55,7 @@ var (
 				}
 			}
 
-			cfFile, err := substitute.SubstituteEnvFromYaml(cf)
+			cfFile, err := substitute.SubstituteEnvFromByte(cf)
 			if err != nil {
 				log.Fatalf("failed to substitute env: %s", err)
 			}
diff --git a/pkg/patcher/patcher.go b/pkg/patcher/patcher.go
index 67b6da72..91c47e60 100644
--- a/pkg/patcher/patcher.go
+++ b/pkg/patcher/patcher.go
@@ -53,7 +53,7 @@ func PatchesPatcher(patches []string, target []byte) ([]byte, error) {
 				return nil, err
 			}
 
-			p, err := substitute.SubstituteEnvFromYaml(contents)
+			p, err := substitute.SubstituteEnvFromByte(contents)
 			if err != nil {
 				return nil, err
 			}
diff --git a/pkg/substitute/envsubst.go b/pkg/substitute/envsubst.go
index 024ced32..8c029e2f 100644
--- a/pkg/substitute/envsubst.go
+++ b/pkg/substitute/envsubst.go
@@ -20,7 +20,7 @@ func LoadEnv(file []byte) error {
 	return nil
 }
 
-func SubstituteEnvFromYaml(file []byte) ([]byte, error) {
+func SubstituteEnvFromByte(file []byte) ([]byte, error) {
 	filtered := stripYamlComment(file)
 	data, err := envsubst.BytesRestricted(filtered, true, true)
 	if err != nil {
diff --git a/pkg/substitute/envsubst_test.go b/pkg/substitute/envsubst_test.go
index 1c862c30..422a2c49 100644
--- a/pkg/substitute/envsubst_test.go
+++ b/pkg/substitute/envsubst_test.go
@@ -29,7 +29,7 @@ d: default value
 		t.Fatal(err)
 	}
 
-	result, _ := SubstituteEnvFromYaml([]byte(file))
+	result, _ := SubstituteEnvFromByte([]byte(file))
 	if expected != string(result) {
 		t.Errorf("got %s, want %s", string(result), expected)