diff --git a/scripts/config.py b/scripts/config.py
index fb7055898f..50889fc9a1 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -446,7 +446,7 @@ class MbedTLSConfigTool(config_common.ConfigTool):
     """Command line mbedtls_config.h and crypto_config.h manipulation tool."""
 
     def __init__(self):
-        super().__init__(MbedTLSConfigFile)
+        super().__init__(MbedTLSConfigFile.default_path)
         self.config = CombinedConfig(MbedTLSConfigFile(self.args.file),
                                      CryptoConfigFile(self.args.cryptofile))