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 f907eac..02981d0 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
@@ -100,7 +100,7 @@
 
   @Option(
       name = "experimental_aspect_output_propagation",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.STARLARK_SEMANTICS,
       effectTags = {OptionEffectTag.LOADING_AND_ANALYSIS},
       metadataTags = {OptionMetadataTag.EXPERIMENTAL},
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 a541832..ffcd0a8 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
@@ -312,7 +312,7 @@
           .debugDepsetDepth(false)
           .experimentalActionArgs(false)
           .experimentalAllowTagsPropagation(false)
-          .experimentalAspectOutputPropagation(false)
+          .experimentalAspectOutputPropagation(true)
           .experimentalBuildSettingApi(true)
           .experimentalCcSkylarkApiEnabledPackages(ImmutableList.of())
           .experimentalAllowIncrementalRepositoryUpdates(true)