diff --git a/BUILD.gn b/BUILD.gn
index f2e96bbbb4..f9b3afc081 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -211,8 +211,7 @@ rust_flatbuffer("msg_rs") {
 
 # Generates $target_gen_dir/snapshot_deno.bin
 snapshot("snapshot_deno") {
-  js = "$target_gen_dir/bundle/main.js"
-  source_map = "$target_gen_dir/bundle/main.js.map"
+  source_root = "$target_gen_dir/bundle/main.js"
   deps = [
     ":bundle",
   ]
diff --git a/libdeno/BUILD.gn b/libdeno/BUILD.gn
index 47971ee01f..92c5b804e0 100644
--- a/libdeno/BUILD.gn
+++ b/libdeno/BUILD.gn
@@ -98,5 +98,5 @@ v8_executable("test_cc") {
 # Generates $target_gen_dir/snapshot_test.bin
 snapshot("snapshot_test") {
   testonly = true
-  js = "libdeno_test.js"
+  source_root = "libdeno_test.js"
 }
diff --git a/libdeno/deno.gni b/libdeno/deno.gni
index 896902207e..d81fedc72d 100644
--- a/libdeno/deno.gni
+++ b/libdeno/deno.gni
@@ -25,14 +25,9 @@ template("snapshot") {
     visibility = [ ":*" ]  # Only targets in this file can depend on this.
     snapshot_out_bin = "$target_gen_dir/$target_name.bin"
     inputs = [
-      invoker.js,
+      invoker.source_root,
     ]
 
-    # TODO(ry) source_map should not be involved at this layer. Remove the
-    # following.
-    if (defined(invoker.source_map)) {
-      inputs += [ invoker.source_map ]
-    }
     outputs = [
       snapshot_out_bin,
     ]
diff --git a/libdeno/snapshot_creator.cc b/libdeno/snapshot_creator.cc
index fe9011c9db..7e29b61c84 100644
--- a/libdeno/snapshot_creator.cc
+++ b/libdeno/snapshot_creator.cc
@@ -12,7 +12,6 @@ namespace deno {}  // namespace deno
 int main(int argc, char** argv) {
   const char* snapshot_out_bin = argv[1];
   const char* js_fn = argv[2];
-  const char* source_map_fn = argv[3];  // Optional.
 
   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
 
@@ -22,12 +21,6 @@ int main(int argc, char** argv) {
   std::string js_source;
   CHECK(deno::ReadFileToString(js_fn, &js_source));
 
-  std::string source_map;
-  if (source_map_fn != nullptr) {
-    CHECK_EQ(argc, 4);
-    CHECK(deno::ReadFileToString(source_map_fn, &source_map));
-  }
-
   deno_init();
   deno_config config = {deno::empty_buf, nullptr};
   Deno* d = deno_new_snapshotter(config, js_fn, js_source.c_str());