diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 12e1b4bc876e..9aa653a5205d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -13818,7 +13818,7 @@ let
 
   sympy = buildPythonPackage rec {
     name = "sympy-0.7.6";
-    disabled = isPy34 || isPyPy;  # some tests fail
+    disabled = isPy34 || isPy35 || isPyPy;  # some tests fail
 
     src = pkgs.fetchurl {
       url    = "https://pypi.python.org/packages/source/s/sympy/${name}.tar.gz";