diff --git a/headers/modsecurity/rules_properties.h b/headers/modsecurity/rules_properties.h
index ce91cc40..2efea9ab 100644
--- a/headers/modsecurity/rules_properties.h
+++ b/headers/modsecurity/rules_properties.h
@@ -234,7 +234,7 @@ class RulesProperties {
         std::ostringstream *err) {
         int amount_of_rules = 0;
 
-        amount_of_rules = appendRules(from->rules, to->rules, err);
+        amount_of_rules = appendRules(from->m_rules, to->m_rules, err);
         if (amount_of_rules < 0) {
             return amount_of_rules;
         }
@@ -391,7 +391,7 @@ class RulesProperties {
         if (phase >= modsecurity::Phases::NUMBER_OF_PHASES) {
             return NULL;
         }
-        return &rules[phase];
+        return &m_rules[phase];
     }
 
 
@@ -420,7 +420,7 @@ class RulesProperties {
     ConfigString m_uploadDirectory;
     ConfigString m_uploadTmpDirectory;
     std::vector<actions::Action *> defaultActions[8];
-    std::vector<modsecurity::Rule *> rules[8];
+    std::vector<modsecurity::Rule *> m_rules[8];
 };
 
 #endif
diff --git a/src/parser/driver.cc b/src/parser/driver.cc
index 08672aba..7ef8b9c5 100644
--- a/src/parser/driver.cc
+++ b/src/parser/driver.cc
@@ -47,7 +47,7 @@ int Driver::addSecMarker(std::string marker) {
     for (int i = 0; i < modsecurity::Phases::NUMBER_OF_PHASES; i++) {
         Rule *rule = new Rule(marker);
         rule->phase = i;
-        rules[i].push_back(rule);
+        m_rules[i].push_back(rule);
     }
     return 0;
 }
@@ -60,7 +60,7 @@ int Driver::addSecAction(Rule *rule) {
         return false;
     }
 
-    rules[rule->phase].push_back(rule);
+    m_rules[rule->phase].push_back(rule);
 
     return true;
 }
@@ -100,7 +100,7 @@ int Driver::addSecRule(Rule *rule) {
         return false;
     }
     for (int i = 0; i < modsecurity::Phases::NUMBER_OF_PHASES; i++) {
-        std::vector<Rule *> rules = this->rules[i];
+        std::vector<Rule *> rules = m_rules[i];
         for (int j = 0; j < rules.size(); j++) {
             if (rules[j]->rule_id == rule->rule_id) {
                 m_parserError << "Rule id: " << std::to_string(rule->rule_id) \
@@ -111,7 +111,7 @@ int Driver::addSecRule(Rule *rule) {
     }
 
     lastRule = rule;
-    rules[rule->phase].push_back(rule);
+    m_rules[rule->phase].push_back(rule);
     return true;
 }
 
diff --git a/src/rules.cc b/src/rules.cc
index bc04bf94..05f33679 100644
--- a/src/rules.cc
+++ b/src/rules.cc
@@ -85,7 +85,7 @@ Rules::~Rules() {
 
     /** Cleanup the rules */
     for (int i = 0; i < modsecurity::Phases::NUMBER_OF_PHASES; i++) {
-        std::vector<Rule *> rules = this->rules[i];
+        std::vector<Rule *> rules = m_rules[i];
         while (rules.empty() == false) {
             Rule *rule = rules.back();
             rule->refCountDecreaseAndCheck();
@@ -181,7 +181,7 @@ int Rules::evaluate(int phase, Transaction *transaction) {
        return 0;
     }
 
-    std::vector<Rule *> rules = this->rules[phase];
+    std::vector<Rule *> rules = m_rules[phase];
 
     debug(9, "This phase consists of " + std::to_string(rules.size()) + \
         " rule(s).");
@@ -273,7 +273,7 @@ void Rules::debug(int level, std::string message) {
 void Rules::dump() {
     std::cout << "Rules: " << std::endl;
     for (int i = 0; i <= modsecurity::Phases::NUMBER_OF_PHASES; i++) {
-        std::vector<Rule *> rules = this->rules[i];
+        std::vector<Rule *> rules = m_rules[i];
         std::cout << "Phase: " << std::to_string(i);
         std::cout << " (" << std::to_string(rules.size());
         std::cout << " rules)" << std::endl;
diff --git a/test/optimization/optimization.cc b/test/optimization/optimization.cc
index 4116d445..0dd5b14c 100644
--- a/test/optimization/optimization.cc
+++ b/test/optimization/optimization.cc
@@ -68,7 +68,7 @@ int main(int argc, char **argv) {
 
     int nphases = modsecurity::Phases::NUMBER_OF_PHASES;
     for (int i = 0; i < nphases; i++) {
-        std::vector<Rule *> rules = modsecRules->rules[i];
+        std::vector<Rule *> rules = modsecRules->m_rules[i];
         if (rules.size() == 0) {
             continue;
         }