diff --git a/sumpy/m2p.py b/sumpy/m2p.py
index b86009ed7129f7e5cbd64b9dc9c94cd1c5fa235b..d3e2bb0641118a5dbded4b35dc012e17c80074ab 100644
--- a/sumpy/m2p.py
+++ b/sumpy/m2p.py
@@ -118,7 +118,7 @@ void m2p(
                 % endfor
                 loc_mpole_base += ${dimensions};
 
-                #define COEFF(i) mpole_coeff_l[loc_mpole_base+${dimensions}+i]
+                #define COEFF(i) mpole_coeff_l[loc_mpole_base+i]
 
                 % for var, expr in vars_and_exprs:
                     % if var.startswith("output"):
diff --git a/sumpy/symbolic/__init__.py b/sumpy/symbolic/__init__.py
index 6376a158b5d6d45053c2f9d311e26b8eb626d834..fe51e6aaeb8b7c45ef8edfa8e076a23806bc7098 100644
--- a/sumpy/symbolic/__init__.py
+++ b/sumpy/symbolic/__init__.py
@@ -175,8 +175,10 @@ def make_coulomb_kernel_in(var_name, dimensions):
 
     if dimensions == 2:
         return sp.log(sp.sqrt((dist.T*dist)[0,0]))
-    else:
+    elif dimensions == 3:
         return 1/sp.sqrt((dist.T*dist)[0,0])
+    else:
+        raise RuntimeError("unsupported dimensionality")
 
 
 
diff --git a/test/test_kernels.py b/test/test_kernels.py
index 81e56c9ec4c27df078cb3e6a23d62fbedef99246..755b19687781e433787ac7d82dc708ea9551d025 100644
--- a/test/test_kernels.py
+++ b/test/test_kernels.py
@@ -74,7 +74,7 @@ def test_p2m2p(ctx_getter):
     ctx = ctx_getter()
     queue = cl.CommandQueue(ctx)
 
-    res = 10
+    res = 100
 
     dimensions = 3
     sources = np.random.rand(dimensions, 5).astype(np.float32)
@@ -102,7 +102,7 @@ def test_p2m2p(ctx_getter):
     from sumpy.expansion import TaylorExpansion
     texp = TaylorExpansion(
             make_coulomb_kernel_in("b", dimensions),
-            order=2, dimensions=dimensions)
+            order=3, dimensions=dimensions)
 
     coeff_dtype = np.float32
 
@@ -150,17 +150,11 @@ def test_p2m2p(ctx_getter):
 
     if 0:
         import matplotlib.pyplot as pt
-        pt.imshow(potential_dev_direct.get().reshape(res, res))
+        pt.imshow((potential_dev-potential_dev_direct).get().reshape(res, res))
+        pt.colorbar()
         pt.show()
-        pt.imshow(potential_dev.get().reshape(res, res))
-        pt.show()
-
-    print potential_dev-potential_dev_direct
-    print potential_dev
-    print potential_dev_direct
-    #print mpole_coeff
 
-    # }}}
+    assert la.norm((potential_dev-potential_dev_direct).get())/res**2 < 1e-3