diff --git a/skcuda/misc.py b/skcuda/misc.py
index 63dea7c..b5c0557 100644
--- a/skcuda/misc.py
+++ b/skcuda/misc.py
@@ -634,7 +634,7 @@ def diff(x_gpu):
 
 
 # List of available numerical types provided by numpy:
-num_types = [np.sctypeDict[t] for t in \
+num_types = [np.sctypeDict[np.dtype(t).name] for t in \
              np.typecodes['AllInteger']+np.typecodes['AllFloat']]
 
 # Numbers of bytes occupied by each numerical type: