diff --git a/components/esp8266/include/esp_sleep.h b/components/esp8266/include/esp_sleep.h
index 6866eb37..e877c7df 100644
--- a/components/esp8266/include/esp_sleep.h
+++ b/components/esp8266/include/esp_sleep.h
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#pragma once
+
 #include <stdint.h>
 #include "esp_err.h"
 #include "driver/gpio.h"