1 diff --git a/build/moz.configure/toolchain.configure b/build/moz.configure/toolchain.configure
2 index b2192e406678..0b1638b6cf8e 100644
3 --- a/build/moz.configure/toolchain.configure
4 +++ b/build/moz.configure/toolchain.configure
5 @@ -1665,9 +1665,9 @@ def compiler(
6 # This version can be no higher than the version used in
7 # src/bootstrap/src/core/build_steps/llvm.rs's check_llvm_version in the source
8 # code of the minimum supported Rust version.
9 - if info.type in ("clang", "clang-cl") and info.version < "17.0":
10 + if info.type in ("clang", "clang-cl") and info.version < "16.0":
11 raise FatalCheckError(
12 - "Only %s 17.0 or newer is supported (found version %s)."
13 + "Only %s 16.0 or newer is supported (found version %s)."
14 % (("clang/llvm" if info.type == "clang" else "clang-cl"), info.version)
15 )
16 17