diff --git a/cmake/onnxruntime_providers.cmake b/cmake/onnxruntime_providers.cmake
index 53508e64d0..39e00e2592 100644
--- a/cmake/onnxruntime_providers.cmake
+++ b/cmake/onnxruntime_providers.cmake
@@ -696,7 +696,9 @@ if (onnxruntime_USE_TENSORRT)
   endif()
 
   include_directories(${TENSORRT_INCLUDE_DIR})
-
+  # ${TENSORRT_LIBRARY} is empty if we link nvonnxparser_static.
+  # nvonnxparser_static is linked against tensorrt libraries in onnx-tensorrt
+  # See https://github.com/onnx/onnx-tensorrt/blob/8af13d1b106f58df1e98945a5e7c851ddb5f0791/CMakeLists.txt#L121
   set(trt_link_libs cudnn cublas ${CMAKE_DL_LIBS} ${TENSORRT_LIBRARY})
 
   file(GLOB_RECURSE onnxruntime_providers_tensorrt_cc_srcs CONFIGURE_DEPENDS
diff --git a/tools/ci_build/build.py b/tools/ci_build/build.py
index 1e9681be0c..2a32a8bcf2 100644
--- a/tools/ci_build/build.py
+++ b/tools/ci_build/build.py
@@ -499,7 +499,10 @@ def parse_arguments():
         "--use_tvm_hash", action="store_true", help="Build ipp-crypto for hash generation. It is used by TVM EP only"
     )
     parser.add_argument("--use_tensorrt", action="store_true", help="Build with TensorRT")
-    parser.add_argument("--use_tensorrt_builtin_parser", action="store_true", help="Use TensorRT builtin parser")
+    parser.add_argument(
+        "--use_tensorrt_builtin_parser", action="store_true", default=True, help="Use TensorRT builtin parser"
+    )
+    parser.add_argument("--use_tensorrt_oss_parser", action="store_true", help="Use TensorRT OSS parser")
     parser.add_argument(
         "--tensorrt_placeholder_builder", action="store_true", help="Instantiate Placeholder TensorRT Builder"
     )
@@ -916,7 +919,8 @@ def generate_build_tree(
         "-Donnxruntime_USE_TENSORRT=" + ("ON" if args.use_tensorrt else "OFF"),
         "-Donnxruntime_SKIP_AND_PERFORM_FILTERED_TENSORRT_TESTS="
         + ("ON" if not args.tensorrt_placeholder_builder else "OFF"),
-        "-Donnxruntime_USE_TENSORRT_BUILTIN_PARSER=" + ("ON" if args.use_tensorrt_builtin_parser else "OFF"),
+        "-Donnxruntime_USE_TENSORRT_BUILTIN_PARSER="
+        + ("ON" if args.use_tensorrt_builtin_parser and not args.use_tensorrt_oss_parser else "OFF"),
         "-Donnxruntime_TENSORRT_PLACEHOLDER_BUILDER=" + ("ON" if args.tensorrt_placeholder_builder else "OFF"),
         # set vars for TVM
         "-Donnxruntime_USE_TVM=" + ("ON" if args.use_tvm else "OFF"),