diff --git a/headers/modsecurity/collection/variable.h b/headers/modsecurity/collection/variable.h
index 91ddc536..c0881c09 100644
--- a/headers/modsecurity/collection/variable.h
+++ b/headers/modsecurity/collection/variable.h
@@ -33,10 +33,16 @@ namespace collection {
 
 class Variable {
  public:
+    Variable(const std::string *key) :
+        m_key(key),
+        m_value(),
+        m_dynamic_value(false),
+        m_dynamic(false) { }
     Variable(const std::string *key, const std::string *value) :
         m_key(key),
         m_value(value),
-        m_dynamic_value(false) { }
+        m_dynamic_value(false),
+        m_dynamic(false) { }
 
     ~Variable() {
         if (m_dynamic_value) {
@@ -47,6 +53,7 @@ class Variable {
     const std::string *m_key;
     const std::string *m_value;
     bool m_dynamic_value;
+    bool m_dynamic;
 };
 
 }  // namespace collection
diff --git a/src/rule.cc b/src/rule.cc
index c950b292..91393a01 100644
--- a/src/rule.cc
+++ b/src/rule.cc
@@ -420,8 +420,10 @@ std::vector<const collection::Variable *> Rule::getFinalVars(
                 trasn->debug(9, "Variable: " + *key +
                     " is part of the exclusion list, skipping...");
 #endif
-                delete v;
-                v = NULL;
+                if (v->m_dynamic) {
+                    delete v;
+                    v = NULL;
+                }
                 continue;
             }
 
@@ -439,8 +441,10 @@ std::vector<const collection::Variable *> Rule::getFinalVars(
                 }
             }
             if (ignoreVariable) {
-                delete v;
-                v = NULL;
+                if (v->m_dynamic) {
+                    delete v;
+                    v = NULL;
+                }
                 continue;
             }
 
@@ -458,8 +462,10 @@ std::vector<const collection::Variable *> Rule::getFinalVars(
                 }
             }
             if (ignoreVariable) {
-                delete v;
-                v = NULL;
+                if (v->m_dynamic) {
+                    delete v;
+                    v = NULL;
+                }
                 continue;
             }
 
@@ -636,7 +642,9 @@ end_clean:
     while (finalVars.empty() == false) {
         auto *a = finalVars.back();
         finalVars.pop_back();
-        delete a;
+        if (a->m_dynamic) {
+            delete a;
+        }
     }
 
     return false;
@@ -654,7 +662,9 @@ end_exec:
     while (finalVars.empty() == false) {
         auto *a = finalVars.back();
         finalVars.pop_back();
-        delete a;
+        if (a->m_dynamic) {
+            delete a;
+        }
     }
 
     return true;