diff --git a/esphome/const.py b/esphome/const.py
index c2bf86d532..58a997352f 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -102,7 +102,7 @@ PLATFORM_RP2040 = Platform.RP2040
 PLATFORM_RTL87XX = Platform.RTL87XX
 
 
-SOURCE_FILE_EXTENSIONS = {".cpp", ".hpp", ".h", ".c", ".tcc", ".ino"}
+SOURCE_FILE_EXTENSIONS = {".cpp", ".hpp", ".h", ".c", ".tcc", ".ino", ".inc"}
 HEADER_FILE_EXTENSIONS = {".h", ".hpp", ".tcc"}
 SECRETS_FILES = ("secrets.yaml", "secrets.yml")