diff --git a/engine/src/flutter/shell/platform/embedder/embedder.cc b/engine/src/flutter/shell/platform/embedder/embedder.cc
index c8c965fdd68..b719d1ca1d2 100644
--- a/engine/src/flutter/shell/platform/embedder/embedder.cc
+++ b/engine/src/flutter/shell/platform/embedder/embedder.cc
@@ -270,6 +270,16 @@ FlutterResult FlutterEngineRun(size_t version,
     return kInvalidArguments;
   }
 
+  if (SAFE_ACCESS(args, main_path__unused__, nullptr) != nullptr) {
+    FML_LOG(WARNING)
+        << "FlutterProjectArgs.main_path is deprecated and should be set null.";
+  }
+
+  if (SAFE_ACCESS(args, packages_path__unused__, nullptr) != nullptr) {
+    FML_LOG(WARNING) << "FlutterProjectArgs.packages_path is deprecated and "
+                        "should be set null.";
+  }
+
   if (!IsRendererValid(config)) {
     return kInvalidArguments;
   }
diff --git a/engine/src/flutter/shell/platform/embedder/embedder.h b/engine/src/flutter/shell/platform/embedder/embedder.h
index 535fb702dc5..069578522ad 100644
--- a/engine/src/flutter/shell/platform/embedder/embedder.h
+++ b/engine/src/flutter/shell/platform/embedder/embedder.h
@@ -185,14 +185,24 @@ typedef struct {
   // string can be collected after the call to |FlutterEngineRun| returns. The
   // string must be NULL terminated.
   const char* assets_path;
-  // The path to the Dart file containing the |main| entry point. The string can
-  // be collected after the call to |FlutterEngineRun| returns. The string must
-  // be NULL terminated.
-  const char* main_path;
+  // The path to the Dart file containing the |main| entry point.
+  // The string can be collected after the call to |FlutterEngineRun| returns.
+  // The string must be NULL terminated.
+  //
+  // \deprecated As of Dart 2, running from Dart source is no longer supported.
+  // Dart code should now be compiled to kernel form and will be loaded by from
+  // |kernel_blob.bin| in the assets directory. This struct member is retained
+  // for ABI stability.
+  const char* main_path__unused__;
   // The path to the |.packages| for the project. The string can be collected
   // after the call to |FlutterEngineRun| returns. The string must be NULL
   // terminated.
-  const char* packages_path;
+  //
+  // \deprecated As of Dart 2, running from Dart source is no longer supported.
+  // Dart code should now be compiled to kernel form and will be loaded by from
+  // |kernel_blob.bin| in the assets directory. This struct member is retained
+  // for ABI stability.
+  const char* packages_path__unused__;
   // The path to the icudtl.dat file for the project. The string can be
   // collected after the call to |FlutterEngineRun| returns. The string must
   // be NULL terminated.
diff --git a/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc b/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc
index 266cf92e55a..deaf8206b66 100644
--- a/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc
+++ b/engine/src/flutter/shell/platform/embedder/tests/embedder_unittests.cc
@@ -29,8 +29,6 @@ TEST(EmbedderTest, CanLaunchAndShutdownWithValidProjectArgs) {
   FlutterProjectArgs args = {};
   args.struct_size = sizeof(FlutterProjectArgs);
   args.assets_path = testing::GetFixturesPath();
-  args.main_path = "";
-  args.packages_path = "";
 
   FlutterEngine engine = nullptr;
   FlutterResult result = FlutterEngineRun(FLUTTER_ENGINE_VERSION, &config,