diff --git a/var/spack/repos/builtin/packages/mgis/package.py b/var/spack/repos/builtin/packages/mgis/package.py
index d51327c3c06..a31fd6db8db 100644
--- a/var/spack/repos/builtin/packages/mgis/package.py
+++ b/var/spack/repos/builtin/packages/mgis/package.py
@@ -46,7 +46,7 @@ class Mgis(CMakePackage):
     depends_on('tfel@3.2.1', when="@1.0.1")
     depends_on('tfel@rliv-3.2', when="@rliv-1.0")
     depends_on('tfel@master', when="@master")
-    depends_on('boost+python', when='+python')
+    depends_on('boost+python+numpy', when='+python')
     extends('python', when='+python')
 
     def cmake_args(self):