diff --git a/src/Type/ArrayType.php b/src/Type/ArrayType.php
index b8487cde25..563beb29ee 100644
--- a/src/Type/ArrayType.php
+++ b/src/Type/ArrayType.php
@@ -179,6 +179,9 @@ public function getIterableKeyType(): Type
 		if ($keyType instanceof StrictMixedType) {
 			return new BenevolentUnionType([new IntegerType(), new StringType()]);
 		}
+		if (!$keyType->isNumericString()->no()) {
+			return TypeCombinator::union(new IntegerType(), $keyType);
+		}
 
 		return $keyType;
 	}