diff --git a/src/Model/Build.php b/src/Model/Build.php
index 166ad6c4..23c975ff 100644
--- a/src/Model/Build.php
+++ b/src/Model/Build.php
@@ -472,13 +472,11 @@ class Build extends BaseBuild
      */
     protected function writeSshKey($cloneTo)
     {
-        $keyPath = $cloneTo . 'temp';
-        $keyFile = $keyPath . '.key';
+        $tempKeyFile = tempnam(sys_get_temp_dir(), 'key_');
 
-        file_put_contents($keyFile, $this->getProject()->getSshPrivateKey());
-        chmod($keyFile, 0600);
+        file_put_contents($tempKeyFile, $this->getProject()->getSshPrivateKey());
 
-        return $keyFile;
+        return $tempKeyFile;
     }
 
     /**
@@ -491,9 +489,6 @@ class Build extends BaseBuild
      */
     protected function writeSshWrapper($cloneTo, $keyFile)
     {
-        $path        = $cloneTo . 'temp';
-        $wrapperFile = $path . '.sh';
-
         $sshFlags = '-o CheckHostIP=no -o IdentitiesOnly=yes -o StrictHostKeyChecking=no -o PasswordAuthentication=no';
 
         // Write out the wrapper script for this build:
@@ -502,11 +497,12 @@ class Build extends BaseBuild
 ssh {$sshFlags} -o IdentityFile={$keyFile} $*
 
 OUT;
+        $tempShFile = tempnam(sys_get_temp_dir(), 'sh_');
 
-        file_put_contents($wrapperFile, $script);
-        shell_exec('chmod +x "' . $wrapperFile . '"');
+        file_put_contents($tempShFile, $script);
+        shell_exec('chmod +x "' . $tempShFile . '"');
 
-        return $wrapperFile;
+        return $tempShFile;
     }
 
     /**
diff --git a/src/Plugin/PhpCpd.php b/src/Plugin/PhpCpd.php
index e4189856..a7e7f7eb 100644
--- a/src/Plugin/PhpCpd.php
+++ b/src/Plugin/PhpCpd.php
@@ -99,7 +99,7 @@ class PhpCpd extends Plugin implements ZeroConfigPluginInterface
 
         $phpcpd = $this->findBinary('phpcpd');
 
-        $tmpFileName = tempnam('/tmp', 'phpcpd');
+        $tmpFileName = tempnam(sys_get_temp_dir(), 'phpcpd_');
 
         $cmd     = $phpcpd . ' --log-pmd "%s" %s "%s"';
         $success = $this->builder->executeCommand($cmd, $tmpFileName, $ignore, $this->path);
diff --git a/src/Plugin/PhpUnit.php b/src/Plugin/PhpUnit.php
index 3f61f7f0..f7988b2e 100644
--- a/src/Plugin/PhpUnit.php
+++ b/src/Plugin/PhpUnit.php
@@ -161,7 +161,7 @@ class PhpUnit extends Plugin implements ZeroConfigPluginInterface
         $buildPath = $this->build->getBuildPath();
 
         // Save the results into a log file
-        $logFile = @tempnam($buildPath, 'jLog_');
+        $logFile = tempnam(sys_get_temp_dir(), 'jlog_');
         $options->addArgument('log-' . $logFormat, $logFile);
 
         // Removes any current configurations files
@@ -258,7 +258,7 @@ class PhpUnit extends Plugin implements ZeroConfigPluginInterface
                     $this->builder, 'php_unit', $error['message'], $severity, $error['file'], $error['line']
                 );
             }
-            @unlink($logFile);
+            unlink($logFile);
         } else {
             throw new \Exception('log output file does not exist: ' . $logFile);
         }