diff --git a/tools/offsets-tool-py/offsets-tool.py b/tools/offsets-tool-py/offsets-tool.py
index 536206aa5c9..04e515f13f2 100644
--- a/tools/offsets-tool-py/offsets-tool.py
+++ b/tools/offsets-tool-py/offsets-tool.py
@@ -61,6 +61,7 @@ class OffsetsTool:
 		parser.add_argument ('--targetdir', dest='target_path', help='path to mono tree configured for target', required=True)
 		parser.add_argument ('--abi=', dest='abi', help='ABI triple to generate', required=True)
 		parser.add_argument ('--sysroot=', dest='sysroot', help='path to sysroot headers of target')
+		parser.add_argument ('--extra-cflag=', dest='extra_cflags', action='append', help='extra flags for clang')
 		args = parser.parse_args ()

 		if not args.libclang or not os.path.isfile (args.libclang):
@@ -78,6 +79,9 @@ class OffsetsTool:
 		self.target_args = []
 		android_api_level = "-D__ANDROID_API=21"

+		if args.extra_cflags:
+ 			self.target_args += args.extra_cflags
+
 		if "wasm" in args.abi:
 			require_emscipten_path (args)
 			self.sys_includes = [args.emscripten_path + "/system/include/libc"]