diff --git a/src/CodeCoverage.php b/src/CodeCoverage.php
index ced3b75df..39b61de2d 100644
--- a/src/CodeCoverage.php
+++ b/src/CodeCoverage.php
@@ -295,10 +295,6 @@ public function append(array $data, $id = null, bool $append = true, $linesToBeC
             throw new RuntimeException;
         }
 
-        $this->applyWhitelistFilter($data);
-        $this->applyIgnoredLinesFilter($data);
-        $this->initializeFilesThatAreSeenTheFirstTime($data);
-
         if (!$append) {
             return;
         }
@@ -316,6 +312,10 @@ public function append(array $data, $id = null, bool $append = true, $linesToBeC
             return;
         }
 
+        $this->applyWhitelistFilter($data);
+        $this->applyIgnoredLinesFilter($data);
+        $this->initializeFilesThatAreSeenTheFirstTime($data);
+
         $size   = 'unknown';
         $status = -1;