diff --git a/src/Generator/RandomGeneratorInterface.php b/src/Generator/RandomGeneratorInterface.php
index 5c83cb4..80c219b 100644
--- a/src/Generator/RandomGeneratorInterface.php
+++ b/src/Generator/RandomGeneratorInterface.php
@@ -22,7 +22,7 @@ interface RandomGeneratorInterface
     /**
      * Generates a string of randomized binary data
      *
-     * @param int $length The number of bytes of random binary data to generate
+     * @param positive-int $length The number of bytes of random binary data to generate
      *
      * @return string A binary string
      */
diff --git a/tests/Generator/CombGeneratorTest.php b/tests/Generator/CombGeneratorTest.php
index dd43d4a..75ef316 100644
--- a/tests/Generator/CombGeneratorTest.php
+++ b/tests/Generator/CombGeneratorTest.php
@@ -87,14 +87,16 @@ class CombGeneratorTest extends TestCase
     }
 
     /**
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ReturnTypeHint.MissingTraversableTypeHintSpecification
+     * @return array<array<positive-int>>
      */
     public function lengthLessThanSix(): array
     {
-        return [[0], [1], [2], [3], [4], [5]];
+        return [[1], [2], [3], [4], [5]];
     }
 
     /**
+     * @param positive-int $length
+     *
      * @throws Exception
      *
      * @dataProvider lengthLessThanSix
diff --git a/tests/Generator/RandomBytesGeneratorTest.php b/tests/Generator/RandomBytesGeneratorTest.php
index 1b09b07..e6259fd 100644
--- a/tests/Generator/RandomBytesGeneratorTest.php
+++ b/tests/Generator/RandomBytesGeneratorTest.php
@@ -15,7 +15,7 @@ use function hex2bin;
 class RandomBytesGeneratorTest extends TestCase
 {
     /**
-     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ReturnTypeHint.MissingTraversableTypeHintSpecification
+     * @return array<array{positive-int, string}>
      */
     public function lengthAndHexDataProvider(): array
     {
@@ -27,6 +27,8 @@ class RandomBytesGeneratorTest extends TestCase
     }
 
     /**
+     * @param positive-int $length
+     *
      * @throws Exception
      *
      * @dataProvider lengthAndHexDataProvider