diff --git a/loopy/target/pyopencl.py b/loopy/target/pyopencl.py
index 7871eadf21f9d193e36b4e3a5fbe0035b0dee5db..9a6be115c8de22f49aa3a889681af279800a6887 100644
--- a/loopy/target/pyopencl.py
+++ b/loopy/target/pyopencl.py
@@ -247,7 +247,7 @@ class ExpressionToPyOpenCLCExpressionMapper(ExpressionToOpenCLCExpressionMapper)
 
             complex_sum = binary_tree_add(0, len(c_applied))
 
-            if real_sum:
+            if reals:
                 return p.Variable("%s_radd" % tgt_name)(real_sum, complex_sum)
             else:
                 return complex_sum