diff --git a/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_call.hpp b/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_call.hpp
index b353032c8..a3a32ec38 100644
--- a/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_call.hpp
+++ b/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_call.hpp
@@ -41,6 +41,9 @@ namespace hex::pl {
         }
 
         [[nodiscard]] std::unique_ptr<ASTNode> evaluate(Evaluator *evaluator) const override {
+            auto startOffset = evaluator->dataOffset();
+            ON_SCOPE_EXIT { evaluator->dataOffset() = startOffset; };
+
             std::vector<Token::Literal> evaluatedParams;
             for (auto &param : this->m_params) {
                 const auto expression = param->evaluate(evaluator)->evaluate(evaluator);
diff --git a/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_definition.hpp b/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_definition.hpp
index c89748b75..cc275b786 100644
--- a/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_definition.hpp
+++ b/lib/libimhex/include/hex/pattern_language/ast/ast_node_function_definition.hpp
@@ -48,9 +48,11 @@ namespace hex::pl {
             evaluator->addCustomFunction(this->m_name, paramCount, [this](Evaluator *ctx, const std::vector<Token::Literal> &params) -> std::optional<Token::Literal> {
                 std::vector<std::shared_ptr<Pattern>> variables;
 
+                auto startOffset = ctx->dataOffset();
                 ctx->pushScope(nullptr, variables);
                 ON_SCOPE_EXIT {
                     ctx->popScope();
+                    ctx->dataOffset() = startOffset;
                 };
 
                 if (this->m_parameterPack.has_value()) {