diff --git a/lib/Minify/Source/Factory.php b/lib/Minify/Source/Factory.php
index cc3648a..2cec8d6 100644
--- a/lib/Minify/Source/Factory.php
+++ b/lib/Minify/Source/Factory.php
@@ -153,12 +153,17 @@ class Minify_Source_Factory {
         }
 
         if ($this->options['checkAllowDirs']) {
+            $inAllowedDir = false;
             foreach ((array)$this->options['allowDirs'] as $allowDir) {
-                if (strpos($this->getNormalizedPath($spec['filepath']), $this->getNormalizedPath($allowDir)) !== 0) {
-                    throw new Minify_Source_FactoryException("File '{$spec['filepath']}' is outside \$allowDirs."
-                        . " If the path is resolved via an alias/symlink, look into the \$min_symlinks option.");
+                if (strpos($this->getNormalizedPath($spec['filepath']), $this->getNormalizedPath($allowDir)) === 0) {
+                    $inAllowedDir = true;
                 }
             }
+
+            if (!$inAllowedDir) {
+                throw new Minify_Source_FactoryException("File '{$spec['filepath']}' is outside \$allowDirs."
+                    . " If the path is resolved via an alias/symlink, look into the \$min_symlinks option.");
+            }
         }
 
         $basename = basename($spec['filepath']);