diff --git a/esphome/components/ld2410/ld2410.h b/esphome/components/ld2410/ld2410.h
index 990437c61d..0008c9deaf 100644
--- a/esphome/components/ld2410/ld2410.h
+++ b/esphome/components/ld2410/ld2410.h
@@ -133,7 +133,7 @@ enum PeriodicDataValue : uint8_t { HEAD = 0xAA, END = 0x55, CHECK = 0x00 };
 
 enum AckDataStructure : uint8_t { COMMAND = 6, COMMAND_STATUS = 7 };
 
-static int two_byte_to_int(char firstbyte, char secondbyte) { return (int16_t) (secondbyte << 8) + firstbyte; }
+static inline int two_byte_to_int(char firstbyte, char secondbyte) { return (int16_t) (secondbyte << 8) + firstbyte; }
 
 class LD2410Component : public Component, public uart::UARTDevice {
 #ifdef USE_SENSOR