diff --git a/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java b/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java
index 62cd394..0bf0114 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java
@@ -1770,7 +1770,8 @@
         }
       }
 
-      if (!ValidationEnvironment.checkBuildSyntax(buildFileAST.getStatements(), eventHandler)) {
+      if (!ValidationEnvironment.checkBuildSyntax(
+          buildFileAST.getStatements(), eventHandler, pkgEnv)) {
         pkgBuilder.setContainsErrors();
       }
 
diff --git a/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java b/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java
index 47ec752..7a1b53d 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/StarlarkSemanticsOptions.java
@@ -444,6 +444,20 @@
   public boolean incompatibleNoTransitiveLoads;
 
   @Option(
+      name = "incompatible_no_kwargs_in_build_files",
+      defaultValue = "false",
+      documentationCategory = OptionDocumentationCategory.STARLARK_SEMANTICS,
+      effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
+      metadataTags = {
+        OptionMetadataTag.INCOMPATIBLE_CHANGE,
+        OptionMetadataTag.TRIGGERED_BY_ALL_INCOMPATIBLE_CHANGES
+      },
+      help =
+          "If set to true, *args and **kwargs are not allowed in BUILD files. See "
+              + "https://github.com/bazelbuild/bazel/issues/8021")
+  public boolean incompatibleNoKwargsInBuildFiles;
+
+  @Option(
       name = "incompatible_remap_main_repo",
       defaultValue = "false",
       documentationCategory = OptionDocumentationCategory.STARLARK_SEMANTICS,
@@ -525,6 +539,7 @@
         .incompatibleExpandDirectories(incompatibleExpandDirectories)
         .incompatibleNewActionsApi(incompatibleNewActionsApi)
         .incompatibleNoAttrLicense(incompatibleNoAttrLicense)
+        .incompatibleNoKwargsInBuildFiles(incompatibleNoKwargsInBuildFiles)
         .incompatibleNoOutputAttrDefault(incompatibleNoOutputAttrDefault)
         .incompatibleNoSupportToolsInActionInputs(incompatibleNoSupportToolsInActionInputs)
         .incompatibleNoTargetOutputGroup(incompatibleNoTargetOutputGroup)
diff --git a/src/main/java/com/google/devtools/build/lib/packages/WorkspaceFactory.java b/src/main/java/com/google/devtools/build/lib/packages/WorkspaceFactory.java
index adb4983..520d588 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/WorkspaceFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/WorkspaceFactory.java
@@ -206,7 +206,7 @@
       }
     }
 
-    if (!ValidationEnvironment.checkBuildSyntax(ast.getStatements(), localReporter)
+    if (!ValidationEnvironment.checkBuildSyntax(ast.getStatements(), localReporter, workspaceEnv)
         || !ast.exec(workspaceEnv, localReporter)) {
       localReporter.handle(Event.error("Error evaluating WORKSPACE file"));
     }
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java b/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java
index 65fc952..d4cb286 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/StarlarkSemantics.java
@@ -160,6 +160,8 @@
 
   public abstract boolean incompatibleNoAttrLicense();
 
+  public abstract boolean incompatibleNoKwargsInBuildFiles();
+
   public abstract boolean incompatibleNoOutputAttrDefault();
 
   public abstract boolean incompatibleNoSupportToolsInActionInputs();
@@ -218,6 +220,7 @@
           .incompatibleExpandDirectories(true)
           .incompatibleNewActionsApi(false)
           .incompatibleNoAttrLicense(true)
+          .incompatibleNoKwargsInBuildFiles(false)
           .incompatibleNoOutputAttrDefault(false)
           .incompatibleNoSupportToolsInActionInputs(false)
           .incompatibleNoTargetOutputGroup(false)
@@ -280,6 +283,8 @@
 
     public abstract Builder incompatibleNewActionsApi(boolean value);
 
+    public abstract Builder incompatibleNoKwargsInBuildFiles(boolean value);
+
     public abstract Builder incompatibleNoAttrLicense(boolean value);
 
     public abstract Builder incompatibleNoOutputAttrDefault(boolean value);
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/ValidationEnvironment.java b/src/main/java/com/google/devtools/build/lib/syntax/ValidationEnvironment.java
index 8c28293..e53fde0 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/ValidationEnvironment.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/ValidationEnvironment.java
@@ -389,7 +389,7 @@
    * **kwargs. This creates a better separation between code and data.
    */
   public static boolean checkBuildSyntax(
-      List<Statement> statements, final EventHandler eventHandler) {
+      List<Statement> statements, final EventHandler eventHandler, Environment env) {
     // Wrap the boolean inside an array so that the inner class can modify it.
     final boolean[] success = new boolean[] {true};
     // TODO(laurentlb): Merge with the visitor above when possible (i.e. when BUILD files use it).
@@ -442,6 +442,9 @@
                         + "explicitly.");
               }
             }
+            if (env.getSemantics().incompatibleNoKwargsInBuildFiles()) {
+              super.visit(node);
+            }
           }
         };
     checker.visitAll(statements);
diff --git a/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java b/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
index 623206c..2b533f9 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/SkylarkSemanticsConsistencyTest.java
@@ -148,6 +148,7 @@
         "--incompatible_expand_directories=" + rand.nextBoolean(),
         "--incompatible_new_actions_api=" + rand.nextBoolean(),
         "--incompatible_no_attr_license=" + rand.nextBoolean(),
+        "--incompatible_no_kwargs_in_build_files=" + rand.nextBoolean(),
         "--incompatible_no_output_attr_default=" + rand.nextBoolean(),
         "--incompatible_no_support_tools_in_action_inputs=" + rand.nextBoolean(),
         "--incompatible_no_target_output_group=" + rand.nextBoolean(),
@@ -192,6 +193,7 @@
         .incompatibleExpandDirectories(rand.nextBoolean())
         .incompatibleNewActionsApi(rand.nextBoolean())
         .incompatibleNoAttrLicense(rand.nextBoolean())
+        .incompatibleNoKwargsInBuildFiles(rand.nextBoolean())
         .incompatibleNoOutputAttrDefault(rand.nextBoolean())
         .incompatibleNoSupportToolsInActionInputs(rand.nextBoolean())
         .incompatibleNoTargetOutputGroup(rand.nextBoolean())
diff --git a/src/test/java/com/google/devtools/build/lib/syntax/EvaluationTest.java b/src/test/java/com/google/devtools/build/lib/syntax/EvaluationTest.java
index df0847c..78700ea 100644
--- a/src/test/java/com/google/devtools/build/lib/syntax/EvaluationTest.java
+++ b/src/test/java/com/google/devtools/build/lib/syntax/EvaluationTest.java
@@ -708,4 +708,17 @@
     new BuildTest()
         .testIfErrorContains("*args arguments are not allowed in BUILD files", "func(*array)");
   }
+
+  @Test
+  public void testIncompatibleKwargsInBuildFiles() throws Exception {
+    new BuildTest("--incompatible_no_kwargs_in_build_files=true")
+        .testIfErrorContains(
+            "kwargs arguments are not allowed in BUILD files", "len(dict(**{'a': 1}))");
+
+    new BuildTest("--incompatible_no_kwargs_in_build_files=false")
+        .testStatement("len(dict(**{'a': 1}))", 1);
+
+    new SkylarkTest("--incompatible_no_kwargs_in_build_files")
+        .testStatement("len(dict(**{'a': 1}))", 1);
+  }
 }
diff --git a/src/test/java/com/google/devtools/build/lib/syntax/util/EvaluationTestCase.java b/src/test/java/com/google/devtools/build/lib/syntax/util/EvaluationTestCase.java
index 88bc26e..365ba1d 100644
--- a/src/test/java/com/google/devtools/build/lib/syntax/util/EvaluationTestCase.java
+++ b/src/test/java/com/google/devtools/build/lib/syntax/util/EvaluationTestCase.java
@@ -201,7 +201,7 @@
       return BuildFileAST.eval(env, input);
     }
     BuildFileAST ast = BuildFileAST.parseString(env.getEventHandler(), input);
-    ValidationEnvironment.checkBuildSyntax(ast.getStatements(), env.getEventHandler());
+    ValidationEnvironment.checkBuildSyntax(ast.getStatements(), env.getEventHandler(), env);
     return ast.eval(env);
   }