diff --git a/builder/frameworks/espidf.py b/builder/frameworks/espidf.py
index 885ac9b88..2a7d677ea 100644
--- a/builder/frameworks/espidf.py
+++ b/builder/frameworks/espidf.py
@@ -118,11 +118,11 @@
         ORIG_BUILD_FLAGS = env.subst("$BUILD_FLAGS")
         ORIG_BUILD_UNFLAGS = env.subst("$BUILD_UNFLAGS")
         ORIG_PROJECT_SRC_DIR = PROJECT_SRC_DIR
-        env("$BUILD_FLAGS").clear()
-        env("$BUILD_UNFLAGS").clear()
+        ["$BUILD_FLAGS"].clear()
+        ["$BUILD_UNFLAGS"].clear()
         PROJECT_SRC_DIR = PROJECT_SRC_DIR.replace("tasmota", "dummy")
-        env("$PROJECT_SRC_DIR").clear()
-        env("$PROJECT_SRC_DIR").append(PROJECT_SRC_DIR)
+        ["$PROJECT_SRC_DIR"].clear()
+        ["$PROJECT_SRC_DIR"].append(PROJECT_SRC_DIR)
 except:
     pass
 print("Source Dir", PROJECT_SRC_DIR)