diff --git a/sumpy/expansion/__init__.py b/sumpy/expansion/__init__.py
index 26c52026e525a9d1c33925b03c4f159b5bc189a0..07e2a745d4b82429d84a257d65fd04bbdc616799 100644
--- a/sumpy/expansion/__init__.py
+++ b/sumpy/expansion/__init__.py
@@ -273,7 +273,8 @@ class CSEMatVec(object):
                 res.append(expr_all[row])
                 continue
             if sac is not None:
-                new_sym = sym.Symbol(sac.assign_unique("compress_temp", expr_all[row]))
+                new_sym = \
+                    sym.Symbol(sac.assign_unique("compress_temp", expr_all[row]))
                 for k, v in deps:
                     expr_all[k] += new_sym * v
             else: