diff --git a/IPython/prefilter.py b/IPython/prefilter.py
index 6da7db7..d317884 100644
--- a/IPython/prefilter.py
+++ b/IPython/prefilter.py
@@ -140,8 +140,8 @@ def prefilter(line_info, ip):
                    checkEscChars,
                    checkAssignment,
                    checkAutomagic,
-                   checkPythonOps,
                    checkAlias,
+                   checkPythonOps,
                    checkAutocall,
                    ]:
         handler = check(line_info, ip)
@@ -238,17 +238,6 @@ def checkAutomagic(l_info,ip):
     return ip.handle_magic
 
         
-def checkPythonOps(l_info,ip):
-    """If the 'rest' of the line begins with a function call or pretty much
-    any python operator, we should simply execute the line (regardless of
-    whether or not there's a possible alias or autocall expansion).  This
-    avoids spurious (and very confusing) geattr() accesses."""
-    if l_info.theRest and l_info.theRest[0] in '!=()<>,+*/%^&|':
-        return ip.handle_normal
-    else:
-        return None
-
-
 def checkAlias(l_info,ip):
     "Check if the initital identifier on the line is an alias."
     # Note: aliases can not contain '.'
@@ -262,6 +251,17 @@ def checkAlias(l_info,ip):
     return ip.handle_alias
 
 
+def checkPythonOps(l_info,ip):
+    """If the 'rest' of the line begins with a function call or pretty much
+    any python operator, we should simply execute the line (regardless of
+    whether or not there's a possible autocall expansion).  This avoids
+    spurious (and very confusing) geattr() accesses."""
+    if l_info.theRest and l_info.theRest[0] in '!=()<>,+*/%^&|':
+        return ip.handle_normal
+    else:
+        return None
+
+
 def checkAutocall(l_info,ip):
     "Check if the initial word/function is callable and autocall is on."
     if not ip.rc.autocall:
diff --git a/test/test_prefilter.py b/test/test_prefilter.py
index 499a5bc..f240303 100644
--- a/test/test_prefilter.py
+++ b/test/test_prefilter.py
@@ -292,6 +292,7 @@ for ac_state in [0,1]:
         # XXX See note above
         #("alias_head.with_dot unshadowed, autocall=%s" % ac_state, handle_alias), 
         ("alias_cmd.something aliases must match whole expr", handle_normal),
+        ("alias_cmd /", handle_alias),
         ])
 
     for ns in [ip.user_ns, ip.IP.internal_ns, __builtin__.__dict__ ]: