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 d38a808..cb74303 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
@@ -316,7 +316,7 @@
 
   @Option(
       name = "incompatible_package_name_is_a_function",
-      defaultValue = "true",
+      defaultValue = "false",
       documentationCategory = OptionDocumentationCategory.SKYLARK_SEMANTICS,
       effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
       metadataTags = {
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 0b5aef5..2062ae1 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
@@ -127,7 +127,7 @@
           .incompatibleGenerateJavaCommonSourceJar(false)
           .incompatibleNewActionsApi(false)
           .incompatibleNoSupportToolsInActionInputs(false)
-          .incompatiblePackageNameIsAFunction(true)
+          .incompatiblePackageNameIsAFunction(false)
           .incompatibleRangeType(false)
           .incompatibleRemoveNativeGitRepository(false)
           .incompatibleRemoveNativeHttpArchive(false)