Index: src/backend/postmaster/autovacuum.c
===================================================================
--- src/backend/postmaster/autovacuum.c	(HEAD)
+++ src/backend/postmaster/autovacuum.c	(FIX)
@@ -1048,9 +1048,9 @@
 				 * What we want here if to skip if next_worker falls between
 				 * the current time and the current time plus naptime.
 				 */
-				if (timestamp_cmp_internal(current_time, next) > 0)
+				if (timestamp_cmp_internal(current_time, next) >= 0)
 					skipit = false;
-				else if (timestamp_cmp_internal(next, curr_plus_naptime) > 0)
+				else if (timestamp_cmp_internal(next, curr_plus_naptime) >= 0)
 					skipit = false;
 				else
 					skipit = true;