diff --git a/include/llmr/style/style_parser.hpp b/include/llmr/style/style_parser.hpp
index 7c7d0a70a..c00c49677 100644
--- a/include/llmr/style/style_parser.hpp
+++ b/include/llmr/style/style_parser.hpp
@@ -41,7 +41,7 @@ private:
 
     bool parseBoolean(JSVal value);
     std::string parseString(JSVal value);
-    const JSVal& replaceConstant(const JSVal& value);
+    JSVal replaceConstant(JSVal value);
     std::vector<FunctionProperty> parseArray(JSVal value, uint16_t expected_count);
     Color parseColor(JSVal value);
     Value parseValue(JSVal value);
diff --git a/src/style/style_parser.cpp b/src/style/style_parser.cpp
index 0e914964e..83d0eb256 100644
--- a/src/style/style_parser.cpp
+++ b/src/style/style_parser.cpp
@@ -379,7 +379,7 @@ std::string StyleParser::parseString(JSVal value) {
     return { value.GetString(), value.GetStringLength() };
 }
 
-const JSVal& StyleParser::replaceConstant(const JSVal& value) {
+JSVal StyleParser::replaceConstant(JSVal value) {
     if (value.IsString()) {
         const std::string string_value { value.GetString(), value.GetStringLength() };
         auto it = constants.find(string_value);