diff --git a/src/Phpml/FeatureExtraction/TokenCountVectorizer.php b/src/Phpml/FeatureExtraction/TokenCountVectorizer.php
index 4371a7d..993af85 100644
--- a/src/Phpml/FeatureExtraction/TokenCountVectorizer.php
+++ b/src/Phpml/FeatureExtraction/TokenCountVectorizer.php
@@ -39,7 +39,7 @@ class TokenCountVectorizer implements Transformer
      * @param StopWords $stopWords
      * @param float     $minDF
      */
-    public function __construct(Tokenizer $tokenizer, StopWords $stopWords = null, float $minDF = 0)
+    public function __construct(Tokenizer $tokenizer, StopWords $stopWords = null, float $minDF = 0.0)
     {
         $this->tokenizer = $tokenizer;
         $this->stopWords = $stopWords;
diff --git a/src/Phpml/Math/Distance/Minkowski.php b/src/Phpml/Math/Distance/Minkowski.php
index 6ed0660..0788193 100644
--- a/src/Phpml/Math/Distance/Minkowski.php
+++ b/src/Phpml/Math/Distance/Minkowski.php
@@ -17,7 +17,7 @@ class Minkowski implements Distance
     /**
      * @param float $lambda
      */
-    public function __construct(float $lambda = 3)
+    public function __construct(float $lambda = 3.0)
     {
         $this->lambda = $lambda;
     }