diff --git a/esphome/components/dynamic_lamp/dynamic_lamp.cpp b/esphome/components/dynamic_lamp/dynamic_lamp.cpp
index 268377bbef..647fc1a2ef 100644
--- a/esphome/components/dynamic_lamp/dynamic_lamp.cpp
+++ b/esphome/components/dynamic_lamp/dynamic_lamp.cpp
@@ -230,7 +230,7 @@ std::array<bool, 16> DynamicLampComponent::get_lamp_outputs_by_name(std::string
 bool DynamicLampComponent::add_timer(std::string lamp_name, bool timer_active, uint8_t mode, uint8_t hour,
                                      uint8_t minute, bool monday, bool tuesday, bool wednesday, bool thursday,
                                      bool friday, bool saturday, bool sunday) {
-  const unsigned char* lamp_name_cstr = lamp_name.c_str();
+  unsigned char* lamp_name_cstr = lamp_name.c_str();
   DynamicLampTimer new_timer;
   new_timer.active = timer_active;
   new_timer.mode = mode;