diff --git a/grpc.def b/grpc.def
index 293f2d8..55b27c2 100644
--- a/grpc.def
+++ b/grpc.def
@@ -232,6 +232,7 @@
     gpr_histogram_merge_contents
     gpr_join_host_port
     gpr_split_host_port
+    gpr_log_severity_string
     gpr_log
     gpr_log_message
     gpr_set_log_verbosity