diff --git a/tools/distrib/check_include_guards.py b/tools/distrib/check_include_guards.py
index 977f40e0b3ec873b1a84849471ae194d81b63f59..463e3168858a893c9018f4dbd8f229c48aa61ca3 100755
--- a/tools/distrib/check_include_guards.py
+++ b/tools/distrib/check_include_guards.py
@@ -167,7 +167,7 @@ argp.add_argument('--precommit',
 args = argp.parse_args()
 
 KNOWN_BAD = set([
-    'src/core/proto/grpc/lb/v0/load_balancer.pb.h',
+    'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.h',
 ])