diff --git a/src/pykx/pandas_api/pandas_indexing.py b/src/pykx/pandas_api/pandas_indexing.py
index a310efd..436875d 100644
--- a/src/pykx/pandas_api/pandas_indexing.py
+++ b/src/pykx/pandas_api/pandas_indexing.py
@@ -328,32 +328,6 @@ def _rename_columns(tab, labels):
                  tab, labels)  # noqa
     else:
         return q('{c:cols x; c:@[c;c?key y;y]; c xcol x}', tab, labels)
-    
-
-def _pre_suf_fix_columns(tab, fix, suf= True):
-        if "Keyed" in str(type(tab)):
-            f =  ("c: `$ (string c) ,\: string y;" if suf 
-                    else "c: `$(string y) ,/: string c;")
-            return q("{c:cols value x;"
-                     + f 
-                     + "key[x]!c xcol value x}",
-                    tab, fix)  # noqa
-        else:
-            f = ("c: `$(string c) ,\: string y;" if suf 
-                 else "c: `$ (string y) ,/: string c;")
-            return q('{c:cols x;' + f + 'c xcol x}', tab, fix)
-        
-        
-def _pre_suf_fix_index(tab, fix, suf= True):
-        if "Keyed" in str(type(tab)):
-            f =  ("idx: `$(string idx) ,\: string y;"  if suf 
-                  else " idx: `$(string y) ,/: string idx;" )
-            return q("{idx:first flip key x;" 
-                     + f 
-                     + "([] idx)!value x}",
-                    tab, fix)  # noqa
-        else:
-            return ValueError('nyi')
 
 
 class PandasIndexing:
@@ -480,30 +454,27 @@ def rename(self, labels=None, index=None, columns=None, axis=0,
 
         return t
     
-    def add_suffix(self, suffix=None, axis=0):
+    def add_suffix(self, suffix, axis=0):
         t = self
         if suffix:
             if axis == 0:
-                t = _pre_suf_fix_columns(t, suffix, suf=True)
+                raise ValueError('nyi')
             elif axis == 1:
-                t = _pre_suf_fix_index(t, suffix, suf=True)
+                c_str = 'cols value' if "Keyed" in str(type(t)) else 'cols'
+                return q(f'{{(c!`$string[c:{c_str} y],\:string x)xcol y}}', suffix, t)
             else:
                 raise ValueError(f'No axis named {axis}')
-        else:
-                raise ValueError("missing 1 required positional argument: 'suffix'")
-        return t
-    
-    def add_prefix(self, prefix=None, axis=0):
+
+    def add_prefix(self, prefix, axis=0):
         t = self
         if prefix:
             if axis == 0:
-                t = _pre_suf_fix_columns(t, prefix, suf=False)
+                raise ValueError('nyi')
             elif axis == 1:
-                t = _pre_suf_fix_index(t, prefix, suf=False)
+                c_str = 'cols value' if "Keyed" in str(type(t)) else 'cols'
+                return q(f'{{(c!`$string[x],/:string c:{c_str} y)xcol y}}', prefix, t)
             else:
                 raise ValueError(f'No axis named {axis}')
-        else:
-                raise ValueError("missing 1 required positional argument: 'prefix'")
         return t
 
     def sample(self, n=None, frac=None, replace=False, weights=None,
@@ -618,7 +589,7 @@ def __init__(self, tab):
     def __getitem__(self, loc):
         if not isinstance(loc, tuple) or len(loc) != 2:
             raise ValueError('Expected 2 values for call to Table.at[]')
-        if q('{y in keys x(string y)}', self.tab, loc[1]):
+        if q('{y in keys x}', self.tab, loc[1]):
             raise QError('Can\'t get the value of a key in a KeyedTable using at.')
         return q('{x[y][z]}', self.tab, loc[0], loc[1])
 
diff --git a/tests/test_pandas_api.py b/tests/test_pandas_api.py
index a5fffbe..2fb7421 100644
--- a/tests/test_pandas_api.py
+++ b/tests/test_pandas_api.py
@@ -1406,42 +1406,35 @@ def test_df_add_prefix(kx, q):
     q('sym:`aaa`bbb`ccc')
     t = q('([] 10?sym; til 10; 10?10; 10?1f)')
 
-    rez = t.add_prefix("col_")
-    
+    rez = t.add_prefix("col_", axis=1)
+
     assert(q('{x~y}', rez, t.pd().add_prefix("col_")))
 
     kt = kx.q('([idx:til 5] til 5; 5?5; 5?1f; (5;5)#100?" ")')
-    kt_res = kx.q('([idx: `col_0`col_1`col_2`col_3`col_4] til 5)')
-
-    rez = kt.add_prefix("col_")
-    assert(q('{x~y}', rez, kt.pd().add_prefix("col_")))
 
     rez = kt.add_prefix("col_", axis=1)
-    assert(q('{x~y}', kx.q("{(0!x) `idx}",rez), kx.q("{(0!x) `idx}",kt_res)))
+    assert(q('{x~y}', rez, kt.pd().add_prefix("col_")))
 
     with pytest.raises(ValueError):
-        t.add_prefix()
+        t.add_prefix("col_", axis=0)
+
 
 def test_df_add_suffix(kx, q):
     q('sym:`aaa`bbb`ccc')
     t = q('([] 10?sym; til 10; 10?10; 10?1f)')
 
-    rez = t.add_suffix("_col")
-    
+    rez = t.add_suffix("_col", axis=1)
+
     assert(q('{x~y}', rez, t.pd().add_suffix("_col")))
 
     kt = kx.q('([idx:til 5] til 5; 5?5; 5?1f; (5;5)#100?" ")')
-    kt_res = kx.q('([idx: `0_col`1_col`2_col`3_col`4_col] til 5)')
 
     rez = kt.add_suffix("_col", axis=1)
-    assert(q('{x~y}', kx.q("{(0!x) `idx}",rez), kx.q("{(0!x) `idx}",kt_res)))
-
-
-    rez = kt.add_suffix("_col")
     assert(q('{x~y}', rez, kt.pd().add_suffix("_col")))
 
     with pytest.raises(ValueError):
-        t.add_suffix()
+        t.add_suffix("_col", axis=0)
+
 
 @pytest.mark.pandas_api
 @pytest.mark.xfail(reason='Flaky randomization')