diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index acd005eb97..8d6eb0b7bb 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -165,6 +165,7 @@ static PQcommMethods PqCommSocketMethods = {
 
 PQcommMethods *PqCommMethods = &PqCommSocketMethods;
 
+WaitEventSet *FeBeWaitSet;
 
 
 /* --------------------------------
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index 109fdf72b5..547d3b8234 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -96,7 +96,7 @@ extern ssize_t secure_raw_write(Port *port, const void *ptr, size_t len);
 
 extern bool ssl_loaded_verify_locations;
 
-WaitEventSet *FeBeWaitSet;
+extern WaitEventSet *FeBeWaitSet;
 
 /* GUCs */
 extern char *SSLCipherSuites;