diff --git a/examples/struct_and_perf.py b/examples/struct_and_perf.py
index ed74258..abdb7f0 100644
--- a/examples/struct_and_perf.py
+++ b/examples/struct_and_perf.py
@@ -23,8 +23,6 @@ def events() -> PerfEventArray:
 @section("tracepoint/syscalls/sys_enter_clone")
 def hello(ctx: c_void_p) -> c_int32:
     dataobj = data_t()
-    ts = ktime()
-    process_id = pid()
     strobj = "hellohellohello"
     dataobj.pid = pid()
     dataobj.ts = ktime()
diff --git a/examples/sys_sync.py b/examples/sys_sync.py
index 953cb11..f8cf45b 100644
--- a/examples/sys_sync.py
+++ b/examples/sys_sync.py
@@ -1,5 +1,5 @@
 from pythonbpf import bpf, map, section, bpfglobal, compile
-from pythonbpf.helpers import ktime
+from pythonbpf.helper.helpers import ktime
 from pythonbpf.maps import HashMap
 
 from ctypes import c_void_p, c_int64, c_uint64
@@ -10,6 +10,7 @@ from ctypes import c_void_p, c_int64, c_uint64
 # 3. Run the program with sudo: sudo tools/check.sh run examples/sys_sync.o
 # 4. Start a Python repl and `import os` and then keep entering `os.sync()` to see reponses.
 
+
 @bpf
 @map
 def last() -> HashMap:
diff --git a/pythonbpf/expr_pass.py b/pythonbpf/expr_pass.py
index db3ffbb..1c497be 100644
--- a/pythonbpf/expr_pass.py
+++ b/pythonbpf/expr_pass.py
@@ -23,7 +23,7 @@ def eval_expr(func, module, builder, expr, local_sym_tab, map_sym_tab, structs_s
             return None
     elif isinstance(expr, ast.Call):
         # delayed import to avoid circular dependency
-        from .bpf_helper_handler import helper_func_list, handle_helper_call
+        from .helper.bpf_helper_handler import helper_func_list, handle_helper_call
 
         if isinstance(expr.func, ast.Name):
             # check deref
diff --git a/pythonbpf/functions_pass.py b/pythonbpf/functions_pass.py
index 0b99546..04e9c52 100644
--- a/pythonbpf/functions_pass.py
+++ b/pythonbpf/functions_pass.py
@@ -2,7 +2,7 @@ from llvmlite import ir
 import ast
 
 
-from .bpf_helper_handler import helper_func_list, handle_helper_call
+from .helper.bpf_helper_handler import helper_func_list, handle_helper_call
 from .type_deducer import ctypes_to_ir
 from .binary_ops import handle_binary_op
 from .expr_pass import eval_expr, handle_expr
diff --git a/pythonbpf/bpf_helper_handler.py b/pythonbpf/helper/bpf_helper_handler.py
similarity index 99%
rename from pythonbpf/bpf_helper_handler.py
rename to pythonbpf/helper/bpf_helper_handler.py
index cfce892..fe8fbe0 100644
--- a/pythonbpf/bpf_helper_handler.py
+++ b/pythonbpf/helper/bpf_helper_handler.py
@@ -1,6 +1,6 @@
 import ast
 from llvmlite import ir
-from .expr_pass import eval_expr
+from pythonbpf.expr_pass import eval_expr
 from enum import Enum
 
 
diff --git a/pythonbpf/helpers.py b/pythonbpf/helper/helpers.py
similarity index 100%
rename from pythonbpf/helpers.py
rename to pythonbpf/helper/helpers.py