diff --git a/llvm.spec b/llvm.spec
index 37c1eeebaacc70c989d82d29c88c8530e63e0925..76de520de2f60e21d825cb219402db4b64714143 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -9,7 +9,7 @@
 # Build sys_llvm packages or compat packages
 %bcond_without sys_llvm
 %bcond_without check
-%bcond_with toolchain_clang
+%bcond_without toolchain_clang
 
 # mlir requires pybind11-2.9 but 22.03 only have pybind11-2.8
 %if %{os_version} <= 2203
@@ -150,7 +150,7 @@ Name:		  llvm
 Name:		  llvm-toolset-%{maj_ver}
 %endif
 Version:	%{maj_ver}.%{min_ver}.%{patch_ver}
-Release:	35
+Release:	36
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -2831,6 +2831,9 @@ fi
 #endregion files
 
 %changelog
+* Thu Apr 17 2025 liyunfei <liyunfei33@huawei.com> - 17.0.6-36
+- switch back to clang compiler
+
 * Wed Apr 16 2025 liyunfei <liyunfei33@huawei.com> - 17.0.6-35
 - bump release so that separated clang pacakges could be updated
 - update to real upstream url