diff --git a/Package.swift b/Package.swift
index 5936cfd..b4ddb82 100644
--- a/Package.swift
+++ b/Package.swift
@@ -52,6 +52,7 @@ let package = Package(
             name: "AliasTests",
             dependencies: [
                 "Alias",
+                "AliasPlugin",
                 .product(name: "SwiftSyntax", package: "swift-syntax"),
                 .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
                 .product(name: "SwiftCompilerPlugin", package: "swift-syntax"),
diff --git a/Sources/AliasPlugin/AliasMacro.swift b/Sources/AliasPlugin/AliasMacro.swift
index bc536dd..d611f27 100644
--- a/Sources/AliasPlugin/AliasMacro.swift
+++ b/Sources/AliasPlugin/AliasMacro.swift
@@ -128,9 +128,37 @@ extension AliasMacro {
         }
 
         guard let binding = varDecl.bindings.first,
-              let identifier = binding.pattern.as(IdentifierPatternSyntax.self)?.identifier,
-              binding.typeAnnotation != nil else {
-            context.diagnose(AliasMacroDiagnostic.specifyTypeExplicitly.diagnose(at: varDecl))
+              let identifier = binding.pattern.as(IdentifierPatternSyntax.self)?.identifier else {
+            context.diagnose(AliasMacroDiagnostic.unsupportedDeclaration.diagnose(at: varDecl))
+            return []
+        }
+
+        var typeAnnotation: TypeAnnotationSyntax?
+        if let specifiedType = binding.typeAnnotation {
+            typeAnnotation = specifiedType
+        } else if let defaultValue = binding.initializer?.value {
+            var type: TypeSyntax?
+            switch defaultValue {
+            case _ where defaultValue.is(StringLiteralExprSyntax.self):
+                type = "Swift.String"
+            case _ where defaultValue.is(IntegerLiteralExprSyntax.self):
+                type = "Swift.Int"
+            case _ where defaultValue.is(FloatLiteralExprSyntax.self):
+                type = "Swift.Double"
+            case _ where defaultValue.is(BooleanLiteralExprSyntax.self):
+                type = "Swift.Bool"
+            default: break
+            }
+            if let type {
+                typeAnnotation = .init(
+                    type: type,
+                    trailingTrivia: .space
+                )
+            }
+        }
+
+        guard let typeAnnotation else {
+            context.diagnose(AliasMacroDiagnostic.specifyTypeExplicitly.diagnose(at: binding))
             return []
         }
 
@@ -147,6 +175,7 @@ extension AliasMacro {
                         binding
                             .with(\.pattern, .init(IdentifierPatternSyntax(identifier: .identifier(arguments.alias))))
                             .with(\.initializer, nil)
+                            .with(\.typeAnnotation, typeAnnotation)
                             .with(\.accessorBlock, .init(accessors:
                                     .accessors(
                                         AccessorDeclListSyntax {
diff --git a/Tests/AliasTests/AliasTests.swift b/Tests/AliasTests/AliasTests.swift
index dbadf4a..6fc8546 100644
--- a/Tests/AliasTests/AliasTests.swift
+++ b/Tests/AliasTests/AliasTests.swift
@@ -48,6 +48,29 @@ final class AliasTests: XCTestCase {
         )
     }
 
+    func testVariableAliasWithLiteral() throws {
+        assertMacroExpansion(
+             """
+             @Alias("newText", access: .inherit)
+             fileprivate var string = "text"
+             """,
+             expandedSource:
+             """
+             fileprivate var string = "text"
+
+             fileprivate var newText: Swift.String {
+                 set {
+                     string  = newValue
+                 }
+                 get {
+                     string
+                 }
+             }
+             """,
+             macros: macros
+        )
+    }
+
     func testFunctionAlias() throws {
         assertMacroExpansion(
             """
@@ -342,19 +365,19 @@ final class AliasTests: XCTestCase {
         assertMacroExpansion(
              """
              @Alias("newText", access: .inherit)
-             fileprivate var string = "text"
+             fileprivate var string = String()
              """,
              expandedSource:
              """
-             fileprivate var string = "text"
+             fileprivate var string = String()
              """,
              diagnostics: [
                 DiagnosticSpec(
                     message: AliasMacroDiagnostic
                         .specifyTypeExplicitly
                         .message,
-                    line: 1,
-                    column: 1
+                    line: 2,
+                    column: 17
                 )
              ],
              macros: macros