diff --git a/conf.py b/conf.py
index 0a163e7d3c..0454ff5ec5 100644
--- a/conf.py
+++ b/conf.py
@@ -178,6 +178,7 @@ exclude_patterns = ["**/build*",
                     "ports/cxd56/spresense-exported-sdk",
                     "ports/esp32s2/certificates",
                     "ports/esp32s2/esp-idf",
+                    "ports/esp32s2/.idf_tools",
                     "ports/esp32s2/peripherals",
                     "ports/litex/hw",
                     "ports/minimal",