diff --git a/coderd/database/queries.sql.go b/coderd/database/queries.sql.go
index 74cefd09359b0..c8963e6a1e41e 100644
--- a/coderd/database/queries.sql.go
+++ b/coderd/database/queries.sql.go
@@ -62,7 +62,11 @@ WITH latest AS (
 		ON workspaces.id = workspace_builds.workspace_id
 	JOIN templates
 		ON templates.id = workspaces.template_id
-	WHERE workspace_builds.workspace_id = $2::uuid
+	WHERE
+		workspace_builds.workspace_id = $2::uuid
+		-- Prebuilt workspaces (identified by having the prebuilds system user as owner_id)
+		-- are managed by the reconciliation loop and not subject to activity bumping
+	  	AND workspaces.owner_id != 'c42fdf75-3097-471c-8c33-fb52454d81c0'::UUID
 	ORDER BY workspace_builds.build_number DESC
 	LIMIT 1
 )
diff --git a/coderd/database/queries/activitybump.sql b/coderd/database/queries/activitybump.sql
index 09349d29e5d06..28896c4a94ea8 100644
--- a/coderd/database/queries/activitybump.sql
+++ b/coderd/database/queries/activitybump.sql
@@ -52,7 +52,11 @@ WITH latest AS (
 		ON workspaces.id = workspace_builds.workspace_id
 	JOIN templates
 		ON templates.id = workspaces.template_id
-	WHERE workspace_builds.workspace_id = @workspace_id::uuid
+	WHERE
+		workspace_builds.workspace_id = @workspace_id::uuid
+		-- Prebuilt workspaces (identified by having the prebuilds system user as owner_id)
+		-- are managed by the reconciliation loop and not subject to activity bumping
+	  	AND workspaces.owner_id != 'c42fdf75-3097-471c-8c33-fb52454d81c0'::UUID
 	ORDER BY workspace_builds.build_number DESC
 	LIMIT 1
 )
diff --git a/coderd/workspacestats/reporter.go b/coderd/workspacestats/reporter.go
index 58d177f1c2071..f6b8a8dd0953b 100644
--- a/coderd/workspacestats/reporter.go
+++ b/coderd/workspacestats/reporter.go
@@ -149,33 +149,36 @@ func (r *Reporter) ReportAgentStats(ctx context.Context, now time.Time, workspac
 		return nil
 	}
 
-	// check next autostart
-	var nextAutostart time.Time
-	if workspace.AutostartSchedule.String != "" {
-		templateSchedule, err := (*(r.opts.TemplateScheduleStore.Load())).Get(ctx, r.opts.Database, workspace.TemplateID)
-		// If the template schedule fails to load, just default to bumping
-		// without the next transition and log it.
-		switch {
-		case err == nil:
-			next, allowed := schedule.NextAutostart(now, workspace.AutostartSchedule.String, templateSchedule)
-			if allowed {
-				nextAutostart = next
+	// Prebuilds are not subject to activity-based deadline bumps
+	if !workspace.IsPrebuild() {
+		// check next autostart
+		var nextAutostart time.Time
+		if workspace.AutostartSchedule.String != "" {
+			templateSchedule, err := (*(r.opts.TemplateScheduleStore.Load())).Get(ctx, r.opts.Database, workspace.TemplateID)
+			// If the template schedule fails to load, just default to bumping
+			// without the next transition and log it.
+			switch {
+			case err == nil:
+				next, allowed := schedule.NextAutostart(now, workspace.AutostartSchedule.String, templateSchedule)
+				if allowed {
+					nextAutostart = next
+				}
+			case database.IsQueryCanceledError(err):
+				r.opts.Logger.Debug(ctx, "query canceled while loading template schedule",
+					slog.F("workspace_id", workspace.ID),
+					slog.F("template_id", workspace.TemplateID))
+			default:
+				r.opts.Logger.Error(ctx, "failed to load template schedule bumping activity, defaulting to bumping by 60min",
+					slog.F("workspace_id", workspace.ID),
+					slog.F("template_id", workspace.TemplateID),
+					slog.Error(err),
+				)
 			}
-		case database.IsQueryCanceledError(err):
-			r.opts.Logger.Debug(ctx, "query canceled while loading template schedule",
-				slog.F("workspace_id", workspace.ID),
-				slog.F("template_id", workspace.TemplateID))
-		default:
-			r.opts.Logger.Error(ctx, "failed to load template schedule bumping activity, defaulting to bumping by 60min",
-				slog.F("workspace_id", workspace.ID),
-				slog.F("template_id", workspace.TemplateID),
-				slog.Error(err),
-			)
 		}
-	}
 
-	// bump workspace activity
-	ActivityBumpWorkspace(ctx, r.opts.Logger.Named("activity_bump"), r.opts.Database, workspace.ID, nextAutostart)
+		// bump workspace activity
+		ActivityBumpWorkspace(ctx, r.opts.Logger.Named("activity_bump"), r.opts.Database, workspace.ID, nextAutostart)
+	}
 
 	// bump workspace last_used_at
 	r.opts.UsageTracker.Add(workspace.ID)