diff --git a/src/main/java/com/google/devtools/build/lib/packages/semantics/BuildLanguageOptions.java b/src/main/java/com/google/devtools/build/lib/packages/semantics/BuildLanguageOptions.java
index 8f3d8d738a2b0b..128aa1bfbb7e16 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/semantics/BuildLanguageOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/semantics/BuildLanguageOptions.java
@@ -651,7 +651,7 @@ public final class BuildLanguageOptions extends OptionsBase {
 
   @Option(
       name = "incompatible_disable_objc_library_transition",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.STARLARK_SEMANTICS,
       effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
       metadataTags = {OptionMetadataTag.INCOMPATIBLE_CHANGE},
@@ -879,7 +879,7 @@ public StarlarkSemantics toStarlarkSemantics() {
   public static final String INCOMPATIBLE_OBJC_PROVIDER_REMOVE_LINKING_INFO =
       "-incompatible_objc_provider_remove_linking_info";
   public static final String INCOMPATIBLE_DISABLE_OBJC_LIBRARY_TRANSITION =
-      "-incompatible_disable_objc_library_transition";
+      "+incompatible_disable_objc_library_transition";
   public static final String INCOMPATIBLE_FAIL_ON_UNKNOWN_ATTRIBUTES =
       "+incompatible_fail_on_unknown_attributes";
   public static final String INCOMPATIBLE_ENABLE_PROTO_TOOLCHAIN_RESOLUTION =
diff --git a/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcRuleTestCase.java b/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcRuleTestCase.java
index 7c65ab0cecf3d9..a1466b420128df 100644
--- a/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcRuleTestCase.java
+++ b/src/test/java/com/google/devtools/build/lib/rules/objc/ObjcRuleTestCase.java
@@ -69,6 +69,7 @@
 import java.util.Map;
 import java.util.regex.Pattern;
 import javax.annotation.Nullable;
+import org.junit.Before;
 
 /**
  * Superclass for all Obj-C rule tests.
@@ -89,6 +90,11 @@ public abstract class ObjcRuleTestCase extends BuildViewTestCase {
 
   protected static final String OUTPUTDIR = TestConstants.PRODUCT_NAME + "-out//bin";
 
+  @Before
+  public void setUp() throws Exception {
+    setBuildLanguageOptions("--noincompatible_disable_objc_library_transition");
+  }
+
   /** Specification of code coverage behavior. */
   public enum CodeCoverageMode {
     // No code coverage information.