diff --git a/esphome/components/sensor/filter.h b/esphome/components/sensor/filter.h
index 606c820f26..dc822157d1 100644
--- a/esphome/components/sensor/filter.h
+++ b/esphome/components/sensor/filter.h
@@ -499,10 +499,9 @@ template<size_t N> class CalibrateLinearFilter : public Filter {
   explicit CalibrateLinearFilter(std::initializer_list<std::array<float, 3>> linear_functions) {
     size_t i = 0;
     for (const auto &f : linear_functions) {
-      if (i >= N)
-        break;
       this->linear_functions_[i++] = f;
     }
+    ESPHOME_DEBUG_ASSERT(i == N);
   }
   optional<float> new_value(float value) override {
     return calibrate_linear_compute(this->linear_functions_.data(), N, value);