diff --git a/plugins/builtin/source/content/lang_builtin_functions.cpp b/plugins/builtin/source/content/lang_builtin_functions.cpp
index e9272fb08..53fd02a2b 100644
--- a/plugins/builtin/source/content/lang_builtin_functions.cpp
+++ b/plugins/builtin/source/content/lang_builtin_functions.cpp
@@ -195,6 +195,11 @@ namespace hex::plugin::builtin {
 
             return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned64Bit, u64(result) });
         });
+
+        /* dataSize() */
+        ContentRegistry::PatternLanguageFunctions::add("dataSize", ContentRegistry::PatternLanguageFunctions::NoParameters, [](auto &ctx, auto params) -> ASTNode* {
+            return new ASTNodeIntegerLiteral({ Token::ValueType::Unsigned64Bit, u64(SharedData::currentProvider->getActualSize()) });
+        });
     }
 
 }
\ No newline at end of file