diff --git a/var/spack/repos/builtin/packages/prmon/package.py b/var/spack/repos/builtin/packages/prmon/package.py
index 323b0a52d8..c42ea79a65 100644
--- a/var/spack/repos/builtin/packages/prmon/package.py
+++ b/var/spack/repos/builtin/packages/prmon/package.py
@@ -30,6 +30,8 @@ class Prmon(CMakePackage):
     depends_on("cmake@3.3:", type="build")
     depends_on("spdlog", when="@3.0.0:")
     depends_on("py-matplotlib", type="run", when="+plot")
+    depends_on("py-numpy", type="run", when="+plot")
+    depends_on("py-pandas", type="run", when="+plot")
 
     def cmake_args(self):
         args = [