diff --git a/esphome/components/lock/lock.cpp b/esphome/components/lock/lock.cpp
index 9fa1ba3600..4c61418256 100644
--- a/esphome/components/lock/lock.cpp
+++ b/esphome/components/lock/lock.cpp
@@ -2,6 +2,7 @@
 #include "esphome/core/defines.h"
 #include "esphome/core/controller_registry.h"
 #include "esphome/core/log.h"
+#include "esphome/core/progmem.h"
 
 namespace esphome::lock {
 
@@ -84,21 +85,21 @@ LockCall &LockCall::set_state(optional<LockState> state) {
   this->state_ = state;
   return *this;
 }
-LockCall &LockCall::set_state(const std::string &state) {
-  if (str_equals_case_insensitive(state, "LOCKED")) {
+LockCall &LockCall::set_state(const char *state) {
+  if (ESPHOME_strcasecmp_P(state, ESPHOME_PSTR("LOCKED")) == 0) {
     this->set_state(LOCK_STATE_LOCKED);
-  } else if (str_equals_case_insensitive(state, "UNLOCKED")) {
+  } else if (ESPHOME_strcasecmp_P(state, ESPHOME_PSTR("UNLOCKED")) == 0) {
     this->set_state(LOCK_STATE_UNLOCKED);
-  } else if (str_equals_case_insensitive(state, "JAMMED")) {
+  } else if (ESPHOME_strcasecmp_P(state, ESPHOME_PSTR("JAMMED")) == 0) {
     this->set_state(LOCK_STATE_JAMMED);
-  } else if (str_equals_case_insensitive(state, "LOCKING")) {
+  } else if (ESPHOME_strcasecmp_P(state, ESPHOME_PSTR("LOCKING")) == 0) {
     this->set_state(LOCK_STATE_LOCKING);
-  } else if (str_equals_case_insensitive(state, "UNLOCKING")) {
+  } else if (ESPHOME_strcasecmp_P(state, ESPHOME_PSTR("UNLOCKING")) == 0) {
     this->set_state(LOCK_STATE_UNLOCKING);
-  } else if (str_equals_case_insensitive(state, "NONE")) {
+  } else if (ESPHOME_strcasecmp_P(state, ESPHOME_PSTR("NONE")) == 0) {
     this->set_state(LOCK_STATE_NONE);
   } else {
-    ESP_LOGW(TAG, "'%s' - Unrecognized state %s", this->parent_->get_name().c_str(), state.c_str());
+    ESP_LOGW(TAG, "'%s' - Unrecognized state %s", this->parent_->get_name().c_str(), state);
   }
   return *this;
 }
diff --git a/esphome/components/lock/lock.h b/esphome/components/lock/lock.h
index 69fc405713..bebd296eac 100644
--- a/esphome/components/lock/lock.h
+++ b/esphome/components/lock/lock.h
@@ -83,7 +83,8 @@ class LockCall {
   /// Set the state of the lock device.
   LockCall &set_state(optional<LockState> state);
   /// Set the state of the lock device based on a string.
-  LockCall &set_state(const std::string &state);
+  LockCall &set_state(const char *state);
+  LockCall &set_state(const std::string &state) { return this->set_state(state.c_str()); }
 
   void perform();