diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 6d801e7eb..c75799fe5 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -794,7 +794,6 @@ void HighFrequencyLoopRequester::stop() {
   num_requests--;
   this->started_ = false;
 }
-bool HighFrequencyLoopRequester::is_high_frequency() { return num_requests > 0; }
 
 std::string get_mac_address() {
   uint8_t mac[6];
diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index ae505a2d8..187b383f6 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -1732,7 +1732,7 @@ class HighFrequencyLoopRequester {
   void stop();
 
   /// Check whether the loop is running continuously.
-  static bool is_high_frequency();
+  static bool is_high_frequency() { return num_requests > 0; }
 
  protected:
   bool started_{false};