diff --git a/.gitignore b/.gitignore
index 18f62f34..ea64d4e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,4 @@ lib/EpdFont/scripts/output/
 /dependencies.lock
 /sdkconfig.default
 /sdkconfig.defaults
+sdkconfig.sticky
diff --git a/platformio.ini b/platformio.ini
index 2b8205ba..2d73e220 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -98,6 +98,10 @@ custom_sdkconfig =
   CONFIG_ARDUINO_SELECTIVE_COMPILATION=y
   CONFIG_ARDUINO_SELECTIVE_RainMaker=n
   CONFIG_ARDUINO_SELECTIVE_Insights=n
+  ; ESP_SR (speech recognition) only exists in the S3 core; its wrapper includes
+  ; ESP_I2S.h, which the isolated core rebuild can't resolve. Unused here anyway,
+  ; so drop it or the sticky env fails to build.
+  CONFIG_ARDUINO_SELECTIVE_ESP_SR=n
 
 ; Drop unused cloud components from the core rebuild. esp_insights/rainmaker
 ; require embedded server certs the lib builder can't generate