diff --git a/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java b/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
index c398b2f..a913169 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
@@ -345,7 +345,7 @@
 
   @Option(
       name = "incompatible_expand_directories",
-      defaultValue = "false",
+      defaultValue = "true",
       category = "incompatible changes",
       documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
       effectTags = {OptionEffectTag.UNKNOWN},
@@ -548,4 +548,3 @@
         .build();
   }
 }
-
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
index 4cb4ef9..b9e5493 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
@@ -219,7 +219,7 @@
           .incompatibleDisallowLegacyJavaInfo(false)
           .incompatibleDisallowLoadLabelsToCrossPackageBoundaries(false)
           .incompatibleDisallowOldStyleArgsAdd(false)
-          .incompatibleExpandDirectories(false)
+          .incompatibleExpandDirectories(true)
           .incompatibleGenerateJavaCommonSourceJar(false)
           .incompatibleNewActionsApi(false)
           .incompatibleNoAttrLicense(false)
@@ -311,4 +311,3 @@
     public abstract SkylarkSemantics build();
   }
 }
-