diff --git a/esphome/components/sprinkler/sprinkler.cpp b/esphome/components/sprinkler/sprinkler.cpp
index 982d9add1a..59565251c3 100644
--- a/esphome/components/sprinkler/sprinkler.cpp
+++ b/esphome/components/sprinkler/sprinkler.cpp
@@ -647,7 +647,7 @@ void Sprinkler::set_valve_run_duration(const optional<size_t> valve_number, cons
     return;
   }
   auto call = this->valve_[valve_number.value()].run_duration_number->make_call();
-  if (this->valve_[valve_number.value()].run_duration_number->traits.get_unit_of_measurement() == min_str) {
+  if (this->valve_[valve_number.value()].run_duration_number->traits.get_unit_of_measurement() == MIN_STR) {
     call.set_value(run_duration.value() / 60.0);
   } else {
     call.set_value(run_duration.value());
@@ -729,7 +729,7 @@ uint32_t Sprinkler::valve_run_duration(const size_t valve_number) {
     return 0;
   }
   if (this->valve_[valve_number].run_duration_number != nullptr) {
-    if (this->valve_[valve_number].run_duration_number->traits.get_unit_of_measurement() == min_str) {
+    if (this->valve_[valve_number].run_duration_number->traits.get_unit_of_measurement() == MIN_STR) {
       return static_cast<uint32_t>(roundf(this->valve_[valve_number].run_duration_number->state * 60));
     } else {
       return static_cast<uint32_t>(roundf(this->valve_[valve_number].run_duration_number->state));
diff --git a/esphome/components/sprinkler/sprinkler.h b/esphome/components/sprinkler/sprinkler.h
index 5311ae4c05..2e87b43eac 100644
--- a/esphome/components/sprinkler/sprinkler.h
+++ b/esphome/components/sprinkler/sprinkler.h
@@ -11,7 +11,7 @@
 namespace esphome {
 namespace sprinkler {
 
-const std::string min_str = "min";
+const char *MIN_STR = "min";
 
 enum SprinklerState : uint8_t {
   // NOTE: these states are used by both SprinklerValveOperator and Sprinkler (the controller)!