diff --git a/llvm/utils/gn/secondary/clang/test/BUILD.gn b/llvm/utils/gn/secondary/clang/test/BUILD.gn
index 0808c57031e7d..64f423636d86d 100644
--- a/llvm/utils/gn/secondary/clang/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/test/BUILD.gn
@@ -43,7 +43,7 @@ write_lit_config("lit_site_cfg") {
   output = clang_lit_site_cfg_file
   dir = get_path_info(output, "dir")
   extra_values = [
-    "LLVM_WITH_Z3=",  # Must be empty, not 0.
+    "LLVM_WITH_Z3=0",
     "CLANG_BUILD_EXAMPLES=0",
     "CLANG_DEFAULT_CXX_STDLIB=",  # Empty string means "default value" here.
     "CLANG_DEFAULT_PIE_ON_LINUX=0",