diff --git a/internal/cmd/generate-types/impl.go b/internal/cmd/generate-types/impl.go
index c64284ab..6909994c 100644
--- a/internal/cmd/generate-types/impl.go
+++ b/internal/cmd/generate-types/impl.go
@@ -8,11 +8,11 @@ import (
 	"text/template"
 )
 
-func generateImplEncode() string {
-	return mustExecute(implEncodeTemplate, ProtoKinds)
+func generateImplCodec() string {
+	return mustExecute(implCodecTemplate, ProtoKinds)
 }
 
-var implEncodeTemplate = template.Must(template.New("").Parse(`
+var implCodecTemplate = template.Must(template.New("").Parse(`
 {{- /*
   IsZero is an expression testing if 'v' is the zero value.
 */ -}}
diff --git a/internal/cmd/generate-types/main.go b/internal/cmd/generate-types/main.go
index d6bb972a..09e6a8af 100644
--- a/internal/cmd/generate-types/main.go
+++ b/internal/cmd/generate-types/main.go
@@ -38,7 +38,7 @@ func main() {
 
 	chdirRoot()
 	writeSource("internal/filedesc/desc_list_gen.go", generateDescListTypes())
-	writeSource("internal/impl/encode_gen.go", generateImplEncode())
+	writeSource("internal/impl/codec_gen.go", generateImplCodec())
 	writeSource("proto/decode_gen.go", generateProtoDecode())
 	writeSource("proto/encode_gen.go", generateProtoEncode())
 	writeSource("proto/size_gen.go", generateProtoSize())
diff --git a/internal/impl/encode_gen.go b/internal/impl/codec_gen.go
similarity index 100%
rename from internal/impl/encode_gen.go
rename to internal/impl/codec_gen.go
diff --git a/internal/impl/encode_map.go b/internal/impl/codec_map.go
similarity index 100%
rename from internal/impl/encode_map.go
rename to internal/impl/codec_map.go
diff --git a/internal/impl/encode_map_go111.go b/internal/impl/codec_map_go111.go
similarity index 100%
rename from internal/impl/encode_map_go111.go
rename to internal/impl/codec_map_go111.go
diff --git a/internal/impl/encode_map_go112.go b/internal/impl/codec_map_go112.go
similarity index 100%
rename from internal/impl/encode_map_go112.go
rename to internal/impl/codec_map_go112.go
diff --git a/internal/impl/encode_reflect.go b/internal/impl/codec_reflect.go
similarity index 100%
rename from internal/impl/encode_reflect.go
rename to internal/impl/codec_reflect.go
diff --git a/internal/impl/codec_field.go b/internal/impl/codec_tables.go
similarity index 100%
rename from internal/impl/codec_field.go
rename to internal/impl/codec_tables.go
diff --git a/internal/impl/encode_unsafe.go b/internal/impl/codec_unsafe.go
similarity index 100%
rename from internal/impl/encode_unsafe.go
rename to internal/impl/codec_unsafe.go