diff --git a/var/spack/repos/builtin/packages/gnuplot/package.py b/var/spack/repos/builtin/packages/gnuplot/package.py
index 9fb79e6746..59e527fcde 100644
--- a/var/spack/repos/builtin/packages/gnuplot/package.py
+++ b/var/spack/repos/builtin/packages/gnuplot/package.py
@@ -122,7 +122,7 @@ def configure_args(self):
             options.append('--with-qt=no')
 
         if '+wx' in spec:
-            options.append('--with-wx=%s' % spec['wx'].prefix)
+            options.append('--with-wx=%s' % spec['wxwidgets'].prefix)
         else:
             options.append('--disable-wxwidgets')