diff --git a/components/ratgdo/ratgdo.cpp b/components/ratgdo/ratgdo.cpp
index 43eb575..076ff90 100644
--- a/components/ratgdo/ratgdo.cpp
+++ b/components/ratgdo/ratgdo.cpp
@@ -25,7 +25,7 @@ namespace ratgdo {
     static const uint64_t REMOTE_ID = 0x539;
     static const uint16_t STATUS_CMD = 0x81;
 
-    void IRAM_ATTR RATGDOStore::isrObstruction(RATGDOStore* arg)
+    void IRAM_ATTR HOT RATGDOStore::isrObstruction(RATGDOStore* arg)
     {
         if (arg->input_obst.digital_read()) {
             arg->lastObstructionHigh = millis();
diff --git a/components/ratgdo/ratgdo.h b/components/ratgdo/ratgdo.h
index 2999224..00a4552 100644
--- a/components/ratgdo/ratgdo.h
+++ b/components/ratgdo/ratgdo.h
@@ -73,7 +73,7 @@ namespace ratgdo {
         int obstructionLowCount = 0; // count obstruction low pulses
         long lastObstructionHigh = 0; // count time between high pulses from the obst ISR
 
-        static void IRAM_ATTR isrObstruction(RATGDOStore* arg);
+        static void IRAM_ATTR HOT isrObstruction(RATGDOStore* arg);
     };
 
     class RATGDOComponent : public uart::UARTDevice, public Component {