diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 664a37345..c547886b4 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -234,7 +234,7 @@ class MFCompiler
 				}
 				else
 				{
-					$sRealRelativeDir = substr(realpath($sFinalTargetDir.'/'.$sRelativeDir), $iStart);
+					$sRealRelativeDir = substr(realpath($sFinalTargetDir).'/'.$sRelativeDir, $iStart);
 				}
 
 				// Push the other module files