diff --git a/python/jittor/__init__.py b/python/jittor/__init__.py
index dccf1a3f..78ec978a 100644
--- a/python/jittor/__init__.py
+++ b/python/jittor/__init__.py
@@ -7,7 +7,7 @@
 # This file is subject to the terms and conditions defined in
 # file 'LICENSE.txt', which is part of this source code package.
 # ***************************************************************
-__version__ = '1.1.7.14'
+__version__ = '1.1.7.15'
 from . import lock
 with lock.lock_scope():
     from . import compiler
diff --git a/python/jittor/compile_extern.py b/python/jittor/compile_extern.py
index b15dde08..f972dd81 100644
--- a/python/jittor/compile_extern.py
+++ b/python/jittor/compile_extern.py
@@ -268,7 +268,10 @@ def install_nccl(root_folder):
             tar.extractall(root_folder)
 
         LOG.i("installing nccl...")
-        arch_flag = f" -arch={','.join(map(lambda x:'sm_'+str(x),flags.cuda_archs))} "
+        arch_flag = ""
+        if len(flags.cuda_archs):
+            arch_flag = f" -arch=compute_{min(flags.cuda_archs)} "
+            arch_flag += ''.join(map(lambda x:f' -code=sm_{x} ', flags.cuda_archs))
         run_cmd(f"make -j8 src.build CUDA_HOME='{cuda_home}' NVCC_GENCODE='{arch_flag}' ", cwd=dirname)
     return dirname
 
diff --git a/python/jittor/compiler.py b/python/jittor/compiler.py
index 7cf8ddb7..8e7fb815 100644
--- a/python/jittor/compiler.py
+++ b/python/jittor/compiler.py
@@ -982,7 +982,9 @@ with jit_utils.import_scope(import_flags):
 
 flags = core.flags()
 if has_cuda:
-    nvcc_flags += f" -arch={','.join(map(lambda x:'sm_'+str(x),flags.cuda_archs))} "
+    if len(flags.cuda_archs):
+        nvcc_flags += f" -arch=compute_{min(flags.cuda_archs)} "
+        nvcc_flags += ''.join(map(lambda x:f' -code=sm_{x} ', flags.cuda_archs))
 
 flags.cc_path = cc_path
 flags.cc_type = cc_type