diff --git a/src/include/storage/procsignal.h b/src/include/storage/procsignal.h
index 126c44bcf1d..58a042f1b9f 100644
--- a/src/include/storage/procsignal.h
+++ b/src/include/storage/procsignal.h
@@ -36,7 +36,6 @@ typedef enum
 	PROCSIG_BARRIER,			/* global barrier interrupt  */
 	PROCSIG_LOG_MEMORY_CONTEXT, /* ask backend to log the memory contexts */
 	PROCSIG_PARALLEL_APPLY_MESSAGE, /* Message from parallel apply workers */
-	PROCSIG_SLOTSYNC_MESSAGE,	/* ask slot synchronization to stop */
 
 	/* Recovery conflict reasons */
 	PROCSIG_RECOVERY_CONFLICT_FIRST,
@@ -49,6 +48,8 @@ typedef enum
 	PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK,
 	PROCSIG_RECOVERY_CONFLICT_LAST = PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK,
 
+	PROCSIG_SLOTSYNC_MESSAGE,	/* ask slot synchronization to stop */
+
 	NUM_PROCSIGNALS				/* Must be last! */
 } ProcSignalReason;