diff --git a/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/llvm-config.h b/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/llvm-config.h
index 49b4b191e2592..72159a648e06a 100644
--- a/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/llvm-config.h
+++ b/utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/llvm-config.h
@@ -127,6 +127,9 @@
  * in non assert builds */
 #define LLVM_UNREACHABLE_OPTIMIZE 1
 
+/* Define if building LLVM with LLVM_ENABLE_IO_SANDBOX */
+/* LLVM_ENABLE_IO_SANDBOX */
+
 /* Define to 1 if you have the DIA SDK installed, and to 0 if you don't. */
 #define LLVM_ENABLE_DIA_SDK 0
 
diff --git a/utils/bazel/llvm_configs/llvm-config.h.cmake b/utils/bazel/llvm_configs/llvm-config.h.cmake
index 6488d6c01b5c6..9ac0115ee2184 100644
--- a/utils/bazel/llvm_configs/llvm-config.h.cmake
+++ b/utils/bazel/llvm_configs/llvm-config.h.cmake
@@ -126,6 +126,9 @@
  * in non assert builds */
 #cmakedefine01 LLVM_UNREACHABLE_OPTIMIZE
 
+/* Define if building LLVM with LLVM_ENABLE_IO_SANDBOX */
+#cmakedefine01 LLVM_ENABLE_IO_SANDBOX
+
 /* Define to 1 if you have the DIA SDK installed, and to 0 if you don't. */
 #cmakedefine01 LLVM_ENABLE_DIA_SDK