diff --git a/internal/mapper/v04/alerts.go b/internal/mapper/v04/alerts.go
index b7dfea649..338295745 100644
--- a/internal/mapper/v04/alerts.go
+++ b/internal/mapper/v04/alerts.go
@@ -134,9 +134,7 @@ func (m AlertMapper) Decode(source io.ReadCloser) ([]models.AlertGroup, error) {
 		}
 	}
 	for _, rcv := range receivers {
-		for _, ag := range rcv.Groups {
-			groups = append(groups, ag)
-		}
+		groups = append(groups, rcv.Groups...)
 	}
 	return groups, nil
 }
diff --git a/internal/mapper/v05/alerts.go b/internal/mapper/v05/alerts.go
index 24847faa5..600f47845 100644
--- a/internal/mapper/v05/alerts.go
+++ b/internal/mapper/v05/alerts.go
@@ -133,9 +133,7 @@ func (m AlertMapper) Decode(source io.ReadCloser) ([]models.AlertGroup, error) {
 		}
 	}
 	for _, rcv := range receivers {
-		for _, ag := range rcv.Groups {
-			groups = append(groups, ag)
-		}
+		groups = append(groups, rcv.Groups...)
 	}
 	return groups, nil
 }
diff --git a/internal/mapper/v061/alerts.go b/internal/mapper/v061/alerts.go
index ba1ef1ceb..cc8be6c93 100644
--- a/internal/mapper/v061/alerts.go
+++ b/internal/mapper/v061/alerts.go
@@ -132,9 +132,7 @@ func (m AlertMapper) Decode(source io.ReadCloser) ([]models.AlertGroup, error) {
 		}
 	}
 	for _, rcv := range receivers {
-		for _, ag := range rcv.Groups {
-			groups = append(groups, ag)
-		}
+		groups = append(groups, rcv.Groups...)
 	}
 	return groups, nil
 }
diff --git a/internal/mapper/v062/alerts.go b/internal/mapper/v062/alerts.go
index c902db5bd..ceae09a2a 100644
--- a/internal/mapper/v062/alerts.go
+++ b/internal/mapper/v062/alerts.go
@@ -136,9 +136,7 @@ func (m AlertMapper) Decode(source io.ReadCloser) ([]models.AlertGroup, error) {
 		}
 	}
 	for _, rcv := range receivers {
-		for _, ag := range rcv.Groups {
-			groups = append(groups, ag)
-		}
+		groups = append(groups, rcv.Groups...)
 	}
 	return groups, nil
 }