diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index b677fa9c..826dcc7d 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -9,7 +9,7 @@
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
 
-__version__ = '1.3.5.19'
+__version__ = '1.3.5.20'
 from jittor_utils import lock
 with lock.lock_scope():
     ori_int = int
diff --git a/python/jittor/compiler.py b/python/jittor/compiler.py
index c1a6a002..cd2c565a 100644
--- a/python/jittor/compiler.py
+++ b/python/jittor/compiler.py
@@ -1234,10 +1234,11 @@ jit_utils.add_backend(acl_compiler)
 from .extern.rocm import rocm_compiler
 jit_utils.add_backend(rocm_compiler)
 
-for mod in jit_utils.backends:
-    mod.check()
-    # if mod.check():
-        # break
+if not has_cuda:
+    for mod in jit_utils.backends:
+        mod.check()
+        # if mod.check():
+            # break
 
 # build core
 gen_jit_flags()