diff --git a/esphome/components/ota/ota_backend_arduino_rp2040.cpp b/esphome/components/ota/ota_backend_arduino_rp2040.cpp
index 4aa98f78ba..ee1ba48d50 100644
--- a/esphome/components/ota/ota_backend_arduino_rp2040.cpp
+++ b/esphome/components/ota/ota_backend_arduino_rp2040.cpp
@@ -17,16 +17,8 @@ static const char *const TAG = "ota.arduino_rp2040";
 std::unique_ptr<ota::OTABackend> make_ota_backend() { return make_unique<ota::ArduinoRP2040OTABackend>(); }
 
 OTAResponseTypes ArduinoRP2040OTABackend::begin(size_t image_size) {
-  // Handle UPDATE_SIZE_UNKNOWN (0) by calculating available space
-  if (image_size == 0) {
-    // Similar to ESP8266, calculate available space from flash layout
-    extern "C" uint8_t _FS_start;
-    extern "C" uint8_t _FS_end;
-    // Calculate the size of the filesystem area which will be used for OTA
-    size_t fs_size = &_FS_end - &_FS_start;
-    // Reserve some space for filesystem overhead
-    image_size = (fs_size - 0x1000) & 0xFFFFF000;
-  }
+  // OTA size of 0 is not currently handled, but
+  // web_server is not supported for RP2040, so this is not an issue.
   bool ret = Update.begin(image_size, U_FLASH);
   if (ret) {
     rp2040::preferences_prevent_write(true);