diff --git a/src/glog/logging.h.in b/src/glog/logging.h.in
index 9968b96d3..d42f462a1 100644
--- a/src/glog/logging.h.in
+++ b/src/glog/logging.h.in
@@ -370,6 +370,8 @@ DECLARE_string(log_link);
 
 DECLARE_int32(v);  // in vlog_is_on.cc
 
+DECLARE_string(vmodule); // also in vlog_is_on.cc
+
 // Sets the maximum log file size (in MB).
 DECLARE_int32(max_log_size);