diff --git a/llvm/utils/gn/secondary/clang-tools-extra/test/BUILD.gn b/llvm/utils/gn/secondary/clang-tools-extra/test/BUILD.gn
index 832028dce6546f..97715cf8d9c90c 100644
--- a/llvm/utils/gn/secondary/clang-tools-extra/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang-tools-extra/test/BUILD.gn
@@ -34,7 +34,7 @@ write_lit_config("lit_site_cfg") {
     "CLANG_TOOLS_DIR=" + rebase_path("$root_out_dir/bin"),
     "LLVM_LIT_TOOLS_DIR=",  # Intentionally empty, matches cmake build.
     "LLVM_TOOLS_DIR=" + rebase_path("$root_out_dir/bin"),
-    "Python3_EXECUTABLE=$python_path",
+    "PYTHON_EXECUTABLE=$python_path",
   ]
 
   if (clang_enable_static_analyzer) {
diff --git a/llvm/utils/gn/secondary/clang/test/BUILD.gn b/llvm/utils/gn/secondary/clang/test/BUILD.gn
index 12648f84650666..f215c35d6aedcb 100644
--- a/llvm/utils/gn/secondary/clang/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/test/BUILD.gn
@@ -61,7 +61,7 @@ write_lit_config("lit_site_cfg") {
     "LLVM_HOST_TRIPLE=$llvm_current_triple",
     "LLVM_LIT_TOOLS_DIR=",  # Intentionally empty, matches cmake build.
     "LLVM_USE_SANITIZER=",
-    "Python3_EXECUTABLE=$python_path",
+    "PYTHON_EXECUTABLE=$python_path",
     "USE_Z3_SOLVER=",
   ]
 
diff --git a/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn b/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn
index ca24b4b4037838..4437937b887bf5 100644
--- a/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn
@@ -40,7 +40,7 @@ write_cmake_config("lit_common_configured") {
     "COMPILER_RT_RESOLVED_TEST_COMPILER=" +
         rebase_path("$root_build_dir/bin/clang"),
     "COMPILER_RT_TEST_COMPILER_ID=Clang",
-    "Python3_EXECUTABLE=$python_path",
+    "Python3=$python_path",
     "COMPILER_RT_DEBUG_PYBOOL=False",
     "COMPILER_RT_INTERCEPT_LIBDISPATCH_PYBOOL=False",
     "COMPILER_RT_RESOLVED_LIBRARY_OUTPUT_DIR=" +
diff --git a/llvm/utils/gn/secondary/lld/test/BUILD.gn b/llvm/utils/gn/secondary/lld/test/BUILD.gn
index 71d20751c5d726..b0ccb7ea00324e 100644
--- a/llvm/utils/gn/secondary/lld/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/lld/test/BUILD.gn
@@ -23,7 +23,7 @@ template("write_lit_cfg") {
       "LLVM_RUNTIME_OUTPUT_INTDIR=" + rebase_path("$root_out_dir/bin"),
       "LLVM_SOURCE_DIR=" + rebase_path("//llvm"),
       "LLVM_TOOLS_DIR=" + rebase_path("$root_out_dir/bin"),
-      "Python3_EXECUTABLE=$python_path",
+      "PYTHON_EXECUTABLE=$python_path",
       "TARGET_TRIPLE=$llvm_target_triple",
     ]
     values += invoker.extra_values
diff --git a/llvm/utils/gn/secondary/llvm/test/BUILD.gn b/llvm/utils/gn/secondary/llvm/test/BUILD.gn
index 27c96d29f9ef6e..427b2c067884f9 100644
--- a/llvm/utils/gn/secondary/llvm/test/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/test/BUILD.gn
@@ -64,7 +64,7 @@ write_lit_config("lit_site_cfg") {
     "LLVM_NATIVE_ARCH=$native_target",
     "LLVM_USE_INTEL_JITEVENTS=0",
     "LLVM_USE_SANITIZER=",
-    "Python3_EXECUTABLE=$python_path",
+    "PYTHON_EXECUTABLE=$python_path",
     "TARGETS_TO_BUILD=$llvm_targets_to_build_string",
     "TARGET_TRIPLE=$llvm_target_triple",