diff --git a/var/spack/repos/builtin/packages/lzo/package.py b/var/spack/repos/builtin/packages/lzo/package.py
index 18618b12b69..e04c29a9ed1 100644
--- a/var/spack/repos/builtin/packages/lzo/package.py
+++ b/var/spack/repos/builtin/packages/lzo/package.py
@@ -34,7 +34,7 @@ def configure_args(self):
         args += self.enable_or_disable("libs")
         return args
 
-    @run_after('install')
+    @run_after("install")
     def postinstall(self):
         # ensure e.g. #include <lzo/lzo1x.h> works with Cflags: -I${includedir}/lzo in pkgconf
         # by creating symlink ${includedir}/lzo/lzo -> ${includedir}/lzo