diff --git a/src/parser/driver.cc b/src/parser/driver.cc
index ec1b3e3b..a6a9755c 100644
--- a/src/parser/driver.cc
+++ b/src/parser/driver.cc
@@ -43,7 +43,7 @@ Driver::~Driver() {
 }
 
 
-int Driver::addSecMarker(std::string marker, std::unique_ptr<std::string> fileName, int lineNumber) {
+int Driver::addSecMarker(const std::string& marker, std::unique_ptr<std::string> fileName, int lineNumber) {
     // FIXME: we might move this to the parser.
     for (int i = 0; i < modsecurity::Phases::NUMBER_OF_PHASES; i++) {
         RuleMarker *r = new RuleMarker(marker, std::unique_ptr<std::string>(new std::string(*fileName)), lineNumber);
diff --git a/src/parser/driver.h b/src/parser/driver.h
index e973dc8e..20e7ef3c 100644
--- a/src/parser/driver.h
+++ b/src/parser/driver.h
@@ -60,7 +60,7 @@ class Driver : public RulesSetProperties {
 
     int addSecRule(std::unique_ptr<RuleWithActions> rule);
     int addSecAction(std::unique_ptr<RuleWithActions> rule);
-    int addSecMarker(std::string marker, std::unique_ptr<std::string> fileName, int lineNumber);
+    int addSecMarker(const std::string& marker, std::unique_ptr<std::string> fileName, int lineNumber);
     int addSecRuleScript(std::unique_ptr<RuleScript> rule);
 
     bool scan_begin();
diff --git a/test/cppcheck_suppressions.txt b/test/cppcheck_suppressions.txt
index 8989958c..2a6c7aef 100644
--- a/test/cppcheck_suppressions.txt
+++ b/test/cppcheck_suppressions.txt
@@ -60,7 +60,6 @@ ctunullpointer:src/rule_with_operator.cc:135
 ctunullpointer:src/rule_with_operator.cc:95
 passedByValue:src/variables/global.h:109
 passedByValue:src/variables/global.h:110
-passedByValue:src/parser/driver.cc:46
 passedByValue:test/common/modsecurity_test.cc:49
 passedByValue:test/common/modsecurity_test.cc:98
 unreadVariable:src/rule_with_operator.cc:219