diff --git a/var/spack/repos/builtin/packages/xextproto/package.py b/var/spack/repos/builtin/packages/xextproto/package.py
index 97e65ff17be83c47a1b0a59bd86f28c969c35c54..9c1c123527d3823a6501ef0fef8025eec5cc3d8f 100644
--- a/var/spack/repos/builtin/packages/xextproto/package.py
+++ b/var/spack/repos/builtin/packages/xextproto/package.py
@@ -36,6 +36,8 @@ class Xextproto(Package):
     depends_on('pkg-config@0.9.0:', type='build')
     depends_on('util-macros', type='build')
 
+    parallel = False
+
     def install(self, spec, prefix):
         configure('--prefix={0}'.format(prefix))