diff --git a/conf.py b/conf.py
index 1d4c420481..1a90b617b8 100644
--- a/conf.py
+++ b/conf.py
@@ -172,6 +172,7 @@ exclude_patterns = ["**/build*",
                     "ports/atmel-samd/tools",
                     "ports/cxd56/mkspk",
                     "ports/cxd56/spresense-exported-sdk",
+                    "ports/esp32s2/certificates",
                     "ports/esp32s2/esp-idf",
                     "ports/esp32s2/peripherals",
                     "ports/litex/hw",