diff --git a/esphome/components/opentherm/output/output.cpp b/esphome/components/opentherm/output/output.cpp
index f820dc76f1..486aa0d4e7 100644
--- a/esphome/components/opentherm/output/output.cpp
+++ b/esphome/components/opentherm/output/output.cpp
@@ -10,7 +10,7 @@ void opentherm::OpenthermOutput::write_state(float state) {
   ESP_LOGD(TAG, "Received state: %.2f. Min value: %.2f, max value: %.2f", state, min_value_, max_value_);
   this->state = state < 0.003 && this->zero_means_zero_
                     ? 0.0
-                    : clamp(lerp(state, min_value_, max_value_), min_value_, max_value_);
+                    : clamp(std::lerp(min_value_, max_value_, state), min_value_, max_value_);
   this->has_state_ = true;
   ESP_LOGD(TAG, "Output %s set to %.2f", this->id_, this->state);
 }