diff --git a/.test-py2.yml b/.test-py2.yml
index 69302088d5635226b9b4c19dd9f877e074aa9f11..5f49f2490ed92240d76c7f3cf564be7fea292462 100644
--- a/.test-py2.yml
+++ b/.test-py2.yml
@@ -10,4 +10,5 @@ dependencies:
  - conda-forge::sympy
  - python=2.7
  - symengine/label/dev::python-symengine=0.2.0.53.g83912b7=py27_1
+ - ecl=16.1.3=2
  - maxima
diff --git a/.test-py3.yml b/.test-py3.yml
index 24910d55b676a0c7f6c21922a4b0ec6169d17b98..2e5f380d82379dabc8b557ad963afc472123b829 100644
--- a/.test-py3.yml
+++ b/.test-py3.yml
@@ -9,4 +9,5 @@ dependencies:
  - conda-forge::sympy
  - python=3.5
  - symengine/label/dev::python-symengine=0.2.0.53.g83912b7=py35_1
+ - ecl=16.1.3=2
  - maxima