diff --git a/waflib/Build.py b/waflib/Build.py
index 52837618..1e28cd8d 100644
--- a/waflib/Build.py
+++ b/waflib/Build.py
@@ -1066,7 +1066,7 @@ class inst(Task.Task):
 		else:
 			dest = os.path.normpath(Utils.subst_vars(self.install_to, self.env))
 		if not os.path.isabs(dest):
-		    dest = os.path.join(self.env.PREFIX, dest)
+			dest = os.path.join(self.env.PREFIX, dest)
 		if destdir and Options.options.destdir:
 			dest = os.path.join(Options.options.destdir, os.path.splitdrive(dest)[1].lstrip(os.sep))
 		return dest