diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 71c43279a1c76cf57999aedd283d780598ab9117..9aeee7ee0e638158ee02622ff097ea43aa8b8c96 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -255,7 +255,7 @@
 #
 Pylint:
   script:
-  - EXTRA_INSTALL="pybind11 numpy mako"
+  - EXTRA_INSTALL="pybind11 numpy mako matplotlib"
   - py_version=3.6
   # After installation, PyOpenCL cannot be used from the source directory due
   # to package shadowing. To work around this, build in editable mode so there