diff --git a/cmake_modules/FindLibClang.cmake b/cmake_modules/FindLibClang.cmake
index eb7fa09..99b3ea9 100644
--- a/cmake_modules/FindLibClang.cmake
+++ b/cmake_modules/FindLibClang.cmake
@@ -16,7 +16,7 @@
 # most recent versions come first
 set(LIBCLANG_KNOWN_LLVM_VERSIONS 10.0.0 10.0 10
   9.0.1
-  9.0.0 9.0 9
+  9.0.0_1 9.0.0 9.0 9
   8.0.1
   8.0.0_1 8.0.0 8.0 8
   7.1.0 7.1