diff --git a/esphome/components/esp32/core.cpp b/esphome/components/esp32/core.cpp
index e54c07e304..f67706ca5d 100644
--- a/esphome/components/esp32/core.cpp
+++ b/esphome/components/esp32/core.cpp
@@ -15,6 +15,10 @@
 #ifdef USE_ARDUINO
 #include <Esp.h>
 #include <esp32-hal.h>
+// Forward declarations for Arduino watchdog functions (implemented in esp32-hal-misc.c)
+extern "C" void enableLoopWDT();
+extern "C" void disableCore0WDT();
+extern "C" void disableCore1WDT();
 #else
 #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 1, 0)
 #include <esp_clk_tree.h>