diff --git a/builder/frameworks/espidf.py b/builder/frameworks/espidf.py
index fa44c37..8081dfd 100644
--- a/builder/frameworks/espidf.py
+++ b/builder/frameworks/espidf.py
@@ -617,7 +617,6 @@ def prepare_build_envs(config, default_env, debug_allowed=True):
         build_env.AppendUnique(CPPDEFINES=defines, CPPPATH=includes)
         if sys_includes:
             build_env.Append(CCFLAGS=[("-isystem", inc) for inc in sys_includes])
-        build_env.Append(ASFLAGS=build_env.get("CCFLAGS", [])[:])
         build_env.ProcessUnFlags(default_env.get("BUILD_UNFLAGS"))
         if is_build_type_debug:
             build_env.ConfigureDebugFlags()