diff --git a/esphome/core/config.py b/esphome/core/config.py
index 739a8a1aea..f4253bee87 100644
--- a/esphome/core/config.py
+++ b/esphome/core/config.py
@@ -100,9 +100,6 @@ def valid_include(value):
 def valid_project_name(value: str):
     if value.count(".") != 1:
         raise cv.Invalid("project name needs to have a namespace")
-
-    value = value.replace(" ", "_")
-
     return value