diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index ac4bd19be..57d945ab9 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -746,6 +746,9 @@ void Curl_ossl_cleanup(void)
 #else
   ERR_remove_state(0);
 #endif
+
+  /* Free all memory allocated by all configuration modules */
+  CONF_modules_free();
 }
 
 /*