From 6d22542d97d389e40c39c7dc36e206692758f76f Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Tue, 24 Apr 2018 23:10:45 -0500
Subject: [PATCH] Fix Helmholtz PDE

---
 sumpy/expansion/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sumpy/expansion/__init__.py b/sumpy/expansion/__init__.py
index 70449074..b335917c 100644
--- a/sumpy/expansion/__init__.py
+++ b/sumpy/expansion/__init__.py
@@ -490,7 +490,7 @@ class HelmholtzDerivativeWrangler(LinearRecurrenceBasedDerivativeWrangler):
             mi = [0]*self.dim
             mi[d] = 2
             pde_dict[tuple(mi)] = 1
-        pde_dict[tuple([0]*self.dim)] = -1
+        pde_dict[tuple([0]*self.dim)] = 1
         return pde_dict
 
     def get_reduced_coeffs(self):
-- 
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