diff --git a/PHPCI/Plugin/Composer.php b/PHPCI/Plugin/Composer.php
index 1af4abf6..0b89afe0 100644
--- a/PHPCI/Plugin/Composer.php
+++ b/PHPCI/Plugin/Composer.php
@@ -45,8 +45,11 @@ class Composer implements \PHPCI\Plugin
             $this->phpci->logFailure('Could not find Composer.');
             return false;
         }
-
-        $cmd = $composerLocation . ' --no-ansi --no-interaction ';
+        $cmd = '';
+        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
+            $cmd = 'php ';
+        }
+        $cmd .= $composerLocation . ' --no-ansi --no-interaction ';
         $cmd .= ($this->preferDist ? '--prefer-dist' : null) . ' --working-dir="%s" %s';
 
         return $this->phpci->executeCommand($cmd, $this->directory, $this->action);