diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 3ff675eab4d4..724a98d0871e 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -1,5 +1,7 @@
+from nose.tools import assert_equal 
 import numpy as np
 from numpy import ma
+
 import matplotlib
 from matplotlib.testing.decorators import image_comparison, cleanup
 import matplotlib.pyplot as plt
@@ -1279,6 +1281,12 @@ def test_mixed_collection():
     ax.set_xlim(0, 16)
     ax.set_ylim(0, 16)
 
+@cleanup
+def test_subplot_key_hash():
+    ax = plt.subplot(np.float64(5.5), np.int64(1), np.float64(1.2))
+    ax.twinx()
+    assert_equal((5, 1, 0, None), ax.get_subplotspec().get_geometry())
+
 
 if __name__ == '__main__':
     import nose