diff --git a/src/Image.php b/src/Image.php
index 7d708b5..c917246 100644
--- a/src/Image.php
+++ b/src/Image.php
@@ -577,10 +577,14 @@ protected function _gc()
             // safety guard
             return;
         }
+        $suffixLength = strlen($this->_suffix);
         foreach (new DirectoryIterator($imgdir) as $file) {
             if (!$file->isDot() && !$file->isDir()) {
                 if ($file->getMTime() < $expire) {
-                    unlink($file->getPathname());
+                    // only deletes files ending with $this->_suffix
+                    if (substr($file->getFilename(), -($suffixLength)) == $this->_suffix) {
+                        unlink($file->getPathname());
+                    }
                 }
             }
         }
diff --git a/test/ImageTest.php b/test/ImageTest.php
index 001d7ff..835b19c 100644
--- a/test/ImageTest.php
+++ b/test/ImageTest.php
@@ -219,6 +219,27 @@ public function testCaptchaImageCleanup()
         $this->assertFalse(file_exists($filename), "File $filename was found even after GC");
     }
 
+    /**
+     * @group ZF-10006
+     */
+    public function testCaptchaImageCleanupOnlyCaptchaFilesIdentifiedByTheirSuffix()
+    {
+        $this->element->render($this->getView());
+        $filename = $this->testDir."/".$this->captcha->getId().".png";
+        $this->assertTrue(file_exists($filename));
+        //Create other cache file
+        $otherFile = $this->testDir . "/zf10006.cache";
+        file_put_contents($otherFile, '');
+        $this->assertTrue(file_exists($otherFile));
+        $this->captcha->setExpiration(1);
+        $this->captcha->setGcFreq(1);
+        sleep(2);
+        $this->captcha->generate();
+        clearstatcache();
+        $this->assertFalse(file_exists($filename), "File $filename was found even after GC");
+        $this->assertTrue(file_exists($otherFile), "File $otherFile was not found after GC");
+    }
+
     public function testGenerateReturnsId()
     {
         $id = $this->captcha->generate();