diff --git a/sumpy/tools.py b/sumpy/tools.py
index 007b06e7d71c064ed62489cc60820472ead9a2d5..f3398b9cb703839d8d4a824f76ddb917416fe606 100644
--- a/sumpy/tools.py
+++ b/sumpy/tools.py
@@ -387,7 +387,7 @@ class KernelCacheWrapper(object):
 def my_syntactic_subs(expr, subst_dict):
     # Workaround for differing substitution semantics between sympy and symengine.
     # FIXME: This is a hack.
-    from sumpy.symbolic import Basic, Subs, Derivative, USE_SYMENGINE
+    from sumpy.symbolic import Basic, Subs, Derivative
 
     if not isinstance(expr, Basic):
         return expr