diff --git a/.gitignore b/.gitignore
index 8b946c1..6026e89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,6 @@
 espilon_bot/build/
 espilon_bot/sdkconfig
 espilon_bot/sdkconfig.old
-espilon_bot/sdkconfig.defaults
 espilon_bot/.config
 espilon_bot/.config.old
 
diff --git a/espilon_bot/sdkconfig.defaults b/espilon_bot/sdkconfig.defaults
new file mode 100644
index 0000000..db9320d
--- /dev/null
+++ b/espilon_bot/sdkconfig.defaults
@@ -0,0 +1,5 @@
+# Required by core/crypto.c (ChaCha20-Poly1305 + HKDF)
+CONFIG_MBEDTLS_POLY1305_C=y
+CONFIG_MBEDTLS_CHACHA20_C=y
+CONFIG_MBEDTLS_CHACHAPOLY_C=y
+CONFIG_MBEDTLS_HKDF_C=y