diff --git a/src/proxy/tinymitm/ssl.cpp b/src/proxy/tinymitm/ssl.cpp
index 051cf00..dc585bb 100644
--- a/src/proxy/tinymitm/ssl.cpp
+++ b/src/proxy/tinymitm/ssl.cpp
@@ -243,8 +243,7 @@ bool CertificateManager::loadCA(const char* certPath, const char* keyPath)
     if (ret == 0 && derBuff)
     {
         certDer.assign(derBuff->buffer, derBuff->buffer + derBuff->length);
-        free(derBuff->buffer);
-        free(derBuff);
+        wc_FreeDer(&derBuff);
     }
     else
         return false;
@@ -254,8 +253,7 @@ bool CertificateManager::loadCA(const char* certPath, const char* keyPath)
     if (ret == 0 && derBuff)
     {
         keyDer.assign(derBuff->buffer, derBuff->buffer + derBuff->length);
-        free(derBuff->buffer);
-        free(derBuff);
+        wc_FreeDer(&derBuff);
     }
     else
         return false;