diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index e167ee8fcb..8024145535 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -97,16 +97,16 @@ extern void ProcessInterrupts(void);
 
 #define CHECK_FOR_INTERRUPTS() \
 do { \
-	if (InterruptPending) \
+	if (unlikely(InterruptPending)) \
 		ProcessInterrupts(); \
 } while(0)
 #else							/* WIN32 */
 
 #define CHECK_FOR_INTERRUPTS() \
 do { \
-	if (UNBLOCKED_SIGNAL_QUEUE()) \
+	if (unlikely(UNBLOCKED_SIGNAL_QUEUE())) \
 		pgwin32_dispatch_queued_signals(); \
-	if (InterruptPending) \
+	if (unlikely(InterruptPending)) \
 		ProcessInterrupts(); \
 } while(0)
 #endif							/* WIN32 */