diff --git a/esphome/components/mcp3428/mcp3428.cpp b/esphome/components/mcp3428/mcp3428.cpp
index bc9e4b8ee2..b202c01d46 100644
--- a/esphome/components/mcp3428/mcp3428.cpp
+++ b/esphome/components/mcp3428/mcp3428.cpp
@@ -130,7 +130,7 @@ bool MCP3428Component::poll_result(float &voltage) {
   }
 }
 
-float MCP3428Component::convert_anwser_to_voltage_(uint8_t *anwser) {
+float MCP3428Component::convert_anwser_to_voltage_(uint8_t const *anwser) {
   uint8_t config_resolution = (this->prev_config_ >> 2) & 0b00000011;
   uint8_t config_gain = this->prev_config_ & 0b00000011;
 
diff --git a/esphome/components/mcp3428/mcp3428.h b/esphome/components/mcp3428/mcp3428.h
index bce300eed9..b5e7cfded5 100644
--- a/esphome/components/mcp3428/mcp3428.h
+++ b/esphome/components/mcp3428/mcp3428.h
@@ -50,7 +50,7 @@ class MCP3428Component : public Component, public i2c::I2CDevice {
   void abandon_current_measurement() { single_measurement_active_ = false; }
 
  protected:
-  float convert_anwser_to_voltage_(uint8_t *anwser);
+  float convert_anwser_to_voltage_(uint8_t const *anwser);
 
   uint8_t prev_config_{0};
   uint32_t last_config_write_ms_{0};