diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5d968753..e6e868051 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 #### Fixed
 - Fixed XPC Service package type [#435](https://github.com/yonaskolb/XcodeGen/pull/435) @alvarhansen
 - Fixed phase ordering for modulemap and static libary header Copy File phases. [402](https://github.com/yonaskolb/XcodeGen/pull/402) @brentleyjones
+- Add `.intentdefinition` files to sources build phase instead of resources [#442](https://github.com/yonaskolb/XcodeGen/pull/442) @yonaskolb
 
 #### Changed
 - Changed spelling of build phases to **preBuildPhase** and **postBuildPhase**. [402](https://github.com/yonaskolb/XcodeGen/pull/402) @brentleyjones
diff --git a/Sources/XcodeGenKit/SourceGenerator.swift b/Sources/XcodeGenKit/SourceGenerator.swift
index 5ee4ac9d6..129e1653f 100644
--- a/Sources/XcodeGenKit/SourceGenerator.swift
+++ b/Sources/XcodeGenKit/SourceGenerator.swift
@@ -183,8 +183,25 @@ class SourceGenerator {
         }
         if let fileExtension = path.extension {
             switch fileExtension {
-            case "swift", "m", "mm", "cpp", "c", "cc", "S", "xcdatamodeld", "metal": return .sources
-            case "h", "hh", "hpp", "ipp", "tpp", "hxx", "def": return .headers
+            case "swift",
+                 "m",
+                 "mm",
+                 "cpp",
+                 "c",
+                 "cc",
+                 "S",
+                 "xcdatamodeld",
+                 "intentdefinition",
+                 "metal":
+                return .sources
+            case "h",
+                 "hh",
+                 "hpp",
+                 "ipp",
+                 "tpp",
+                 "hxx",
+                 "def":
+                return .headers
             case "modulemap":
                 guard targetType == .staticLibrary else { return nil }
                 return .copyFiles(TargetSource.BuildPhase.CopyFilesSettings(
@@ -192,10 +209,18 @@ class SourceGenerator {
                     subpath: "include/$(PRODUCT_NAME)",
                     phaseOrder: .preCompile
                 ))
-            case "framework": return .frameworks
-            case "xpc": return .copyFiles(.xpcServices)
-            case "xcconfig", "entitlements", "gpx", "lproj", "apns": return nil
-            default: return .resources
+            case "framework":
+                return .frameworks
+            case "xpc":
+                return .copyFiles(.xpcServices)
+            case "xcconfig",
+                 "entitlements",
+                 "gpx",
+                 "lproj",
+                 "apns":
+                return nil
+            default:
+                return .resources
             }
         }
         return nil
diff --git a/Tests/XcodeGenKitTests/SourceGeneratorTests.swift b/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
index 69c152cc0..5054dde86 100644
--- a/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
+++ b/Tests/XcodeGenKitTests/SourceGeneratorTests.swift
@@ -436,6 +436,7 @@ class SourceGeneratorTests: XCTestCase {
                     - file.xcassets
                     - file.metal
                     - Info.plist
+                    - Intent.intentdefinition
                 """
                 try createDirectories(directories)
 
@@ -483,6 +484,7 @@ class SourceGeneratorTests: XCTestCase {
                 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)
+                try pbxProj.expectFile(paths: ["C", "Intent.intentdefinition"], buildPhase: .sources)
             }
 
             $0.it("duplicate TargetSource is included once in sources build phase") {