diff --git a/appveyor.yml b/appveyor.yml
index d16a319..7032d81 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,7 +24,7 @@ init:
 install:
   - cmd: activate condaenv
   - cmd: conda install -yq numpy scipy pip pytest mpmath
-  - cmd: pip install pytest-cov coveralls sympy fluids
+  - cmd: pip install pytest-cov coveralls sympy fluids pint
   - cmd: python setup.py install
 
 test_script: