diff --git a/Sources/OpenAPIKitCompat/Compat30To31.swift b/Sources/OpenAPIKitCompat/Compat30To31.swift
index b16b82c84..01cc8b4bb 100644
--- a/Sources/OpenAPIKitCompat/Compat30To31.swift
+++ b/Sources/OpenAPIKitCompat/Compat30To31.swift
@@ -86,7 +86,7 @@ extension OpenAPIKit30.OpenAPI.Server: To31 {
     /// to facilitate incremental migration within your codebase from OpenAPIKit30 to OpenAPIKit.
     public func to31() -> OpenAPIKit.OpenAPI.Server {
 
-        let newVariables = variables.mapValues { variable in
+        let newVariables: OrderedDictionary<String, OpenAPIKit.OpenAPI.Server.Variable> = variables.mapValues { variable in
             let enumValue: [String]?
             if !variable.enum.isEmpty {
                 enumValue = variable.enum
diff --git a/Tests/OpenAPIKitCompatTests/DocumentConversionTests.swift b/Tests/OpenAPIKitCompatTests/DocumentConversionTests.swift
index c908b9965..f5401e17d 100644
--- a/Tests/OpenAPIKitCompatTests/DocumentConversionTests.swift
+++ b/Tests/OpenAPIKitCompatTests/DocumentConversionTests.swift
@@ -24,6 +24,8 @@ final class DocumentConversionTests: XCTestCase {
 
         try assertEqualNewToOld(newDoc, oldDoc)
         XCTAssertEqual(newDoc.openAPIVersion, .v3_1_0)
+
+        try newDoc.validate()
     }
 
     func test_vendorExtensionsOnDoc() throws {
@@ -39,6 +41,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc = oldDoc.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc, oldDoc)
+
+        try newDoc.validate()
     }
 
     func test_fullInfo() throws {
@@ -60,6 +64,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc = oldDoc.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc, oldDoc)
+
+        try newDoc.validate()
     }
 
     func test_servers() throws {
@@ -93,6 +99,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc = oldDoc.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc, oldDoc)
+
+        try newDoc.validate()
     }
 
     func test_paths() throws {
@@ -194,6 +202,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc = oldDoc.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc, oldDoc)
+
+        try newDoc.validate()
     }
 
     func testJSONSchemas() throws {
@@ -300,6 +310,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc = oldDoc.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc, oldDoc)
+
+        try newDoc.validate()
     }
 
     func testSecurity() throws {
@@ -330,6 +342,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc2 = oldDoc2.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc2, oldDoc2)
+
+        try newDoc.validate()
     }
 
     func testTags() throws {
@@ -371,6 +385,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc3 = oldDoc3.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc3, oldDoc3)
+
+        try newDoc.validate()
     }
 
     func testExternalDocs() throws {
@@ -405,6 +421,8 @@ final class DocumentConversionTests: XCTestCase {
         let newDoc = oldDoc.convert(to: .v3_1_0)
 
         try assertEqualNewToOld(newDoc, oldDoc)
+
+        try newDoc.validate()
     }
 
     // TODO: more tests