diff --git a/pkg/codegen/templates/param-types.tmpl b/pkg/codegen/templates/param-types.tmpl
index b35cce5d7c..f49ba3010b 100644
--- a/pkg/codegen/templates/param-types.tmpl
+++ b/pkg/codegen/templates/param-types.tmpl
@@ -1,6 +1,6 @@
 {{range .}}{{$opid := .OperationId}}
 {{range .TypeDefinitions}}
 // {{.TypeName}} defines parameters for {{$opid}}.
-type {{.TypeName}} {{.Schema.TypeDecl}}
+type {{.TypeName}} {{if and (opts.AliasTypes) (.CanAlias)}}={{end}} {{.Schema.TypeDecl}}
 {{end}}
 {{end}}
diff --git a/pkg/codegen/templates/request-bodies.tmpl b/pkg/codegen/templates/request-bodies.tmpl
index cec74bcb0d..313dd11bf4 100644
--- a/pkg/codegen/templates/request-bodies.tmpl
+++ b/pkg/codegen/templates/request-bodies.tmpl
@@ -1,6 +1,8 @@
 {{range .}}{{$opid := .OperationId}}
 {{range .Bodies}}
-// {{$opid}}RequestBody defines body for {{$opid}} for application/json ContentType.
-type {{$opid}}{{.NameTag}}RequestBody {{.TypeDef}}
+{{with .TypeDef $opid}}
+// {{.TypeName}} defines body for {{$opid}} for application/json ContentType.
+type {{.TypeName}} {{if and (opts.AliasTypes) (.CanAlias)}}={{end}} {{.Schema.TypeDecl}}
+{{end}}
 {{end}}
 {{end}}
diff --git a/pkg/codegen/templates/templates.gen.go b/pkg/codegen/templates/templates.gen.go
index 770ba76fd4..00161ac02d 100644
--- a/pkg/codegen/templates/templates.gen.go
+++ b/pkg/codegen/templates/templates.gen.go
@@ -723,7 +723,7 @@ func GetSwagger() (*openapi3.Swagger, error) {
 	"param-types.tmpl": `{{range .}}{{$opid := .OperationId}}
 {{range .TypeDefinitions}}
 // {{.TypeName}} defines parameters for {{$opid}}.
-type {{.TypeName}} {{.Schema.TypeDecl}}
+type {{.TypeName}} {{if and (opts.AliasTypes) (.CanAlias)}}={{end}} {{.Schema.TypeDecl}}
 {{end}}
 {{end}}
 `,
@@ -757,8 +757,10 @@ func RegisterHandlers(router EchoRouter, si ServerInterface) {
 `,
 	"request-bodies.tmpl": `{{range .}}{{$opid := .OperationId}}
 {{range .Bodies}}
-// {{$opid}}RequestBody defines body for {{$opid}} for application/json ContentType.
-type {{$opid}}{{.NameTag}}RequestBody {{.TypeDef}}
+{{with .TypeDef $opid}}
+// {{.TypeName}} defines body for {{$opid}} for application/json ContentType.
+type {{.TypeName}} {{if and (opts.AliasTypes) (.CanAlias)}}={{end}} {{.Schema.TypeDecl}}
+{{end}}
 {{end}}
 {{end}}
 `,
@@ -772,7 +774,7 @@ type ServerInterface interface {
 `,
 	"typedef.tmpl": `{{range .Types}}
 // {{.TypeName}} defines model for {{.JsonName}}.
-type {{.TypeName}} {{.Schema.TypeDecl}}
+type {{.TypeName}} {{if and (opts.AliasTypes) (.CanAlias)}}={{end}} {{.Schema.TypeDecl}}
 {{- if gt (len .Schema.EnumValues) 0 }}
 // List of {{ .TypeName }}
 const (
diff --git a/pkg/codegen/templates/typedef.tmpl b/pkg/codegen/templates/typedef.tmpl
index 170984fb17..969d7cdea0 100644
--- a/pkg/codegen/templates/typedef.tmpl
+++ b/pkg/codegen/templates/typedef.tmpl
@@ -1,6 +1,6 @@
 {{range .Types}}
 // {{.TypeName}} defines model for {{.JsonName}}.
-type {{.TypeName}} {{.Schema.TypeDecl}}
+type {{.TypeName}} {{if and (opts.AliasTypes) (.CanAlias)}}={{end}} {{.Schema.TypeDecl}}
 {{- if gt (len .Schema.EnumValues) 0 }}
 // List of {{ .TypeName }}
 const (