diff --git a/esphome/components/ld2412/number/light_threshold_number.h b/esphome/components/ld2412/number/light_threshold_number.h
index f62d523af38..710b47957c1 100644
--- a/esphome/components/ld2412/number/light_threshold_number.h
+++ b/esphome/components/ld2412/number/light_threshold_number.h
@@ -7,7 +7,8 @@ namespace esphome::ld2412 {
 
 class LightThresholdNumber final : public number::Number, public Parented<LD2412Component> {
  public:
-  LightThresholdNumber() = default;
+  // User provided, not "= default": `new(p) LightThresholdNumber()` would zero-fill .bss that is already zero.
+  LightThresholdNumber() {}
 
  protected:
   void control(float value) override;