Update build.yaml
diff --git a/config.m4 b/config.m4
index fe20119..a3c078f 100644
--- a/config.m4
+++ b/config.m4
@@ -190,7 +190,7 @@
     src/core/lib/surface/completion_queue.c \
     src/core/lib/surface/completion_queue_factory.c \
     src/core/lib/surface/event_string.c \
-    src/core/lib/surface/lame_client.c \
+    src/core/lib/surface/lame_client.cc \
     src/core/lib/surface/metadata_array.c \
     src/core/lib/surface/server.c \
     src/core/lib/surface/validate_metadata.c \