diff --git a/src/Sav/Record/Info/LongStringMissingValues.php b/src/Sav/Record/Info/LongStringMissingValues.php
index 11c507b..3064e39 100644
--- a/src/Sav/Record/Info/LongStringMissingValues.php
+++ b/src/Sav/Record/Info/LongStringMissingValues.php
@@ -32,7 +32,7 @@ public function write(Buffer $buffer)
             foreach ($this->data as $varName => $values) {
                 $localBuffer->writeInt(mb_strlen($varName));
                 $localBuffer->writeString($varName);
-                $localBuffer->write(\chr(is_countable($values) ? \count($values) : 0), 1);
+                $localBuffer->write(\chr(\is_countable($values) ? \count($values) : 0), 1);
                 $localBuffer->writeInt(8);
                 foreach ($values as $value) {
                     $localBuffer->writeString($value, 8);
diff --git a/src/Sav/Record/Info/LongStringValueLabels.php b/src/Sav/Record/Info/LongStringValueLabels.php
index 010b265..fa623a7 100644
--- a/src/Sav/Record/Info/LongStringValueLabels.php
+++ b/src/Sav/Record/Info/LongStringValueLabels.php
@@ -47,7 +47,7 @@ public function write(Buffer $buffer)
             $localBuffer->writeInt(mb_strlen($varName));
             $localBuffer->writeString($varName);
             $localBuffer->writeInt($width);
-            $localBuffer->writeInt(is_countable($data['values']) ? \count($data['values']) : 0);
+            $localBuffer->writeInt(\is_countable($data['values']) ? \count($data['values']) : 0);
             foreach ($data['values'] as $value => $label) {
                 $localBuffer->writeInt($width);
                 $localBuffer->writeString($value, $width);
diff --git a/src/Sav/Writer.php b/src/Sav/Writer.php
index dd31cc1..fc74667 100644
--- a/src/Sav/Writer.php
+++ b/src/Sav/Writer.php
@@ -191,7 +191,7 @@ public function write($data)
             }
 
             // TODO: refactory
-            $dataCount = is_countable($var->data) ? \count($var->data) : 0;
+            $dataCount = \count($var->data);
 
             if ($dataCount > $this->header->casesCount) {
                 $this->header->casesCount = $dataCount;