diff --git a/build/build-clang/clang-tidy-win32.json b/build/build-clang/clang-tidy-win32.json
index 3bd49b54f6af..097b4274fd34 100644
--- a/build/build-clang/clang-tidy-win32.json
+++ b/build/build-clang/clang-tidy-win32.json
@@ -9,7 +9,7 @@
     "clang_repo": "https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_700/final",
     "extra_repo": "https://llvm.org/svn/llvm-project/clang-tools-extra/tags/RELEASE_700/final",
     "compiler_repo": "https://llvm.org/svn/llvm-project/compiler-rt/tags/RELEASE_700/final",
-    "libcxx_repo": "https://llvm.org/svn/llvm-project/libcxx/trunk",
+    "libcxx_repo": "https://llvm.org/svn/llvm-project/libcxx/tags/RELEASE_700/final",
     "python_path": "c:/mozilla-build/python/python.exe",
     "cc": "cl.exe",
     "cxx": "cl.exe",
diff --git a/build/build-clang/clang-tidy-win64.json b/build/build-clang/clang-tidy-win64.json
index d793edaf3871..3f0ac14f258a 100644
--- a/build/build-clang/clang-tidy-win64.json
+++ b/build/build-clang/clang-tidy-win64.json
@@ -9,7 +9,7 @@
     "clang_repo": "https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_700/final",
     "extra_repo": "https://llvm.org/svn/llvm-project/clang-tools-extra/tags/RELEASE_700/final",
     "compiler_repo": "https://llvm.org/svn/llvm-project/compiler-rt/tags/RELEASE_700/final",
-    "libcxx_repo": "https://llvm.org/svn/llvm-project/libcxx/trunk",
+    "libcxx_repo": "https://llvm.org/svn/llvm-project/libcxx/tags/RELEASE_700/final",
     "python_path": "c:/mozilla-build/python/python.exe",
     "cc": "cl.exe",
     "cxx": "cl.exe",