diff --git a/setup/setuputils.class.inc.php b/setup/setuputils.class.inc.php
index 10e72300b6..6a83fd97c8 100644
--- a/setup/setuputils.class.inc.php
+++ b/setup/setuputils.class.inc.php
@@ -457,7 +457,7 @@ class SetupUtils
 		{
 			$sGraphvizPath = 'dot';
 		}
-		$sCommand = "$sGraphvizPath -V 2>&1";
+		$sCommand = "\"$sGraphvizPath\" -V 2>&1";
 	
 		$aOutput = array();
 		$iRetCode = 0;
@@ -1511,4 +1511,4 @@ class SetupInfo
 	{
 		return (array_key_exists($sModuleId, self::$aSelectedModules));
 	}
-}
\ No newline at end of file
+}