diff --git a/spiceypy/spiceypy.py b/spiceypy/spiceypy.py
index 080e5396..3074515a 100644
--- a/spiceypy/spiceypy.py
+++ b/spiceypy/spiceypy.py
@@ -1896,7 +1896,7 @@ def dafgda(handle, begin, end):
     :rtype: Array of floats
     """
     handle = ctypes.c_int(handle)
-    data = stypes.emptyDoubleVector(abs(end - begin))
+    data = stypes.emptyDoubleVector(abs(end - begin) + 1)
     begin = ctypes.c_int(begin)
     end = ctypes.c_int(end)
     libspice.dafgda_c(handle, begin, end, data)
diff --git a/spiceypy/tests/test_wrapper.py b/spiceypy/tests/test_wrapper.py
index 2fb19ac6..689df1c1 100644
--- a/spiceypy/tests/test_wrapper.py
+++ b/spiceypy/tests/test_wrapper.py
@@ -1007,7 +1007,7 @@ def test_dafgda():
     # not a very good test...
     spice.kclear()
     handle = spice.dafopr(CoreKernels.spk)
-    elements = spice.dafgda(handle, 20, 21)
+    elements = spice.dafgda(handle, 20, 20)
     assert elements == [0.0]
     spice.dafcls(handle)
     spice.kclear()