diff --git a/poky/bitbake/lib/bblayers/query.py b/poky/bitbake/lib/bblayers/query.py
index 6e94c83..525d4f0 100644
--- a/poky/bitbake/lib/bblayers/query.py
+++ b/poky/bitbake/lib/bblayers/query.py
@@ -441,10 +441,10 @@
                     line = fnfile.readline()
 
         # The "require/include xxx" in conf/machine/*.conf, .inc and .bbclass
-        conf_re = re.compile(".*/conf/machine/[^\/]*\.conf$")
-        inc_re = re.compile(".*\.inc$")
+        conf_re = re.compile(r".*/conf/machine/[^\/]*\.conf$")
+        inc_re = re.compile(r".*\.inc$")
         # The "inherit xxx" in .bbclass
-        bbclass_re = re.compile(".*\.bbclass$")
+        bbclass_re = re.compile(r".*\.bbclass$")
         for layerdir in self.bblayers:
             layername = self.get_layer_name(layerdir)
             for dirpath, dirnames, filenames in os.walk(layerdir):