diff --git a/Sources/XcodeGenKit/SourceGenerator.swift b/Sources/XcodeGenKit/SourceGenerator.swift
index 87e27df3..77a6f5d6 100644
--- a/Sources/XcodeGenKit/SourceGenerator.swift
+++ b/Sources/XcodeGenKit/SourceGenerator.swift
@@ -188,7 +188,7 @@ class SourceGenerator {
         }
         if let fileExtension = path.extension {
             switch fileExtension {
-            case "swift", "m", "mm", "cpp", "c", "cc", "S", "xcdatamodeld": return .sources
+            case "swift", "m", "mm", "cpp", "c", "cc", "S", "xcdatamodeld", "metal": return .sources
             case "h", "hh", "hpp", "ipp", "tpp", "hxx", "def": return .headers
             case "modulemap":
                 guard targetType == .staticLibrary else { return nil }
diff --git a/Tests/XcodeGenKitTests/SourceGeneratorTests.swift b/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
index 11525791..b382ab9c 100644
--- a/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
+++ b/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
@@ -390,6 +390,7 @@ class SourceGeneratorTests: XCTestCase {
                     - file.apns
                     - file.123
                     - file.xcassets
+                    - file.metal
                     - Info.plist
                 """
                 try createDirectories(directories)
@@ -437,6 +438,7 @@ class SourceGeneratorTests: XCTestCase {
                 try pbxProj.expectFile(paths: ["C", "file.xcassets"], buildPhase: .resources)
                 try pbxProj.expectFile(paths: ["C", "file.123"], buildPhase: .resources)
                 try pbxProj.expectFile(paths: ["C", "Info.plist"], buildPhase: .none)
+                try pbxProj.expectFile(paths: ["C", "file.metal"], buildPhase: .sources)
             }
 
             $0.it("duplicate TargetSource is included once in sources build phase") {