diff --git a/smem b/smem
index 506a394..5be289b 100755
--- a/smem
+++ b/smem
@@ -94,12 +94,12 @@ class tardata(procdata):
     def _readlines(self, f):
         return self.tar.extractfile(f).readlines()
     def piduser(self, p):
-        t = self.tar.getmember("%d/" % p)
+        t = self.tar.getmember("%d" % p)
         if t.uname:
             self._ucache[t.uid] = t.uname
         return t.uid
     def pidgroup(self, p):
-        t = self.tar.getmember("%d/" % p)
+        t = self.tar.getmember("%d" % p)
         if t.gname:
             self._gcache[t.gid] = t.gname
         return t.gid