2 files changed, 5 insertions, 3 deletions
diff --git a/Userland/Libraries/LibJS/AST.cpp b/Userland/Libraries/LibJS/AST.cpp
index caf127db71..23d7de8836 100644
--- a/Userland/Libraries/LibJS/AST.cpp
+++ b/Userland/Libraries/LibJS/AST.cpp
@@ -62,8 +62,8 @@ private:
 };
 
 ASTNode::ASTNode(SourceRange source_range)
-    : m_source_code(source_range.code)
-    , m_start_offset(source_range.start.offset)
+    : m_start_offset(source_range.start.offset)
+    , m_source_code(source_range.code)
     , m_end_offset(source_range.end.offset)
 {
 }
diff --git a/Userland/Libraries/LibJS/AST.h b/Userland/Libraries/LibJS/AST.h
index a583f917bd..d757eba77a 100644
--- a/Userland/Libraries/LibJS/AST.h
+++ b/Userland/Libraries/LibJS/AST.h
@@ -90,8 +90,10 @@ protected:
     explicit ASTNode(SourceRange);
 
 private:
-    RefPtr<SourceCode> m_source_code;
+    // NOTE: These members are carefully ordered so that `m_start_offset` is packed with the padding after RefCounted::m_ref_count.
+    //       This creates a 4-byte padding hole after `m_end_offset` which is used to pack subclasses better.
     u32 m_start_offset { 0 };
+    RefPtr<SourceCode> m_source_code;
     u32 m_end_offset { 0 };
 };