diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 474ca1e88..0c783a428 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -2633,7 +2633,7 @@ def fromarray(obj, mode=None):
             typekey = (1, 1) + shape[2:], arr["typestr"]
             mode, rawmode = _fromarray_typemap[typekey]
         except KeyError:
-            raise TypeError("Cannot handle this data type")
+            raise TypeError("Cannot handle this data type: %s, %s" % typekey)
     else:
         rawmode = mode
     if mode in ["1", "L", "I", "P", "F"]: