diff --git a/src/backend/access/transam/parallel.c b/src/backend/access/transam/parallel.c
index bc93101ff7..8cba888223 100644
--- a/src/backend/access/transam/parallel.c
+++ b/src/backend/access/transam/parallel.c
@@ -113,7 +113,7 @@ typedef struct FixedParallelState
 int			ParallelWorkerNumber = -1;
 
 /* Is there a parallel message pending which we need to receive? */
-volatile bool ParallelMessagePending = false;
+volatile sig_atomic_t ParallelMessagePending = false;
 
 /* Are we initializing a parallel worker? */
 bool		InitializingParallelWorker = false;
diff --git a/src/include/access/parallel.h b/src/include/access/parallel.h
index 983841d45e..1ec8e33af4 100644
--- a/src/include/access/parallel.h
+++ b/src/include/access/parallel.h
@@ -54,7 +54,7 @@ typedef struct ParallelWorkerContext
 	shm_toc    *toc;
 } ParallelWorkerContext;
 
-extern PGDLLIMPORT volatile bool ParallelMessagePending;
+extern PGDLLIMPORT volatile sig_atomic_t ParallelMessagePending;
 extern PGDLLIMPORT int ParallelWorkerNumber;
 extern PGDLLIMPORT bool InitializingParallelWorker;