diff --git a/src/Repositories/RedisMetricsRepository.php b/src/Repositories/RedisMetricsRepository.php
index 3c3e9697..c3abe54d 100644
--- a/src/Repositories/RedisMetricsRepository.php
+++ b/src/Repositories/RedisMetricsRepository.php
@@ -331,8 +331,8 @@ protected function baseSnapshotData($key)
      */
     protected function minutesSinceLastSnapshot()
     {
-        $lastSnapshotAt = $this->connection()->get('last_snapshot_at')
-                    ?: $this->storeSnapshotTimestamp();
+        $lastSnapshotAt = (int) ($this->connection()->get('last_snapshot_at')
+                                    ?: $this->storeSnapshotTimestamp());
 
         return max(
             (CarbonImmutable::now()->getTimestamp() - $lastSnapshotAt) / 60, 1