diff --git a/var/spack/repos/builtin/packages/mrnet/package.py b/var/spack/repos/builtin/packages/mrnet/package.py
index 8f860556d49..9da9e29a2e9 100644
--- a/var/spack/repos/builtin/packages/mrnet/package.py
+++ b/var/spack/repos/builtin/packages/mrnet/package.py
@@ -44,7 +44,7 @@ class Mrnet(Package):
     depends_on("boost")
 
     def install(self, spec, prefix):
-        # Build the MRNet LW thread safe libraries when the 
+        # Build the MRNet LW thread safe libraries when the
         # lwthreads variant is present
         if '+lwthreads' in spec:
             configure("--prefix=%s" % prefix, "--enable-shared",