diff --git a/headers/modsecurity/transaction.h b/headers/modsecurity/transaction.h
index b7d6ae44..188625e3 100644
--- a/headers/modsecurity/transaction.h
+++ b/headers/modsecurity/transaction.h
@@ -351,7 +351,7 @@ class Transaction : public TransactionAnchoredVariables {
     /**
      * Holds the HTTP version: 1.2, 2.0, 3.0 and so on....
      */
-    const char *m_httpVersion;
+    std::string m_httpVersion;
 
     /**
      * Holds the server IP Address
@@ -361,7 +361,7 @@ class Transaction : public TransactionAnchoredVariables {
     /**
      * Holds the raw URI that was requested.
      */
-    const char *m_uri;
+    std::string m_uri;
 
     /**
      * Holds the URI that was requests (without the query string).
diff --git a/src/transaction.cc b/src/transaction.cc
index a56cc709..b7299478 100644
--- a/src/transaction.cc
+++ b/src/transaction.cc
@@ -1548,8 +1548,8 @@ std::string Transaction::toJSON(int parts) {
         utils::string::dash_if_empty(
             m_variableRequestMethod.evaluate()).c_str());
 
-    LOGFY_ADD_INT("http_version", m_httpVersion);
-    LOGFY_ADD("uri", this->m_uri);
+    LOGFY_ADD_INT("http_version", m_httpVersion.c_str());
+    LOGFY_ADD("uri", this->m_uri.c_str());
 
     if (parts & audit_log::AuditLog::CAuditLogPart) {
         // FIXME: check for the binary content size.