diff --git a/test/bytecode_3.3/09_yield_from.pyc b/test/bytecode_3.3/09_yield_from.pyc
new file mode 100644
index 00000000..f561e363
Binary files /dev/null and b/test/bytecode_3.3/09_yield_from.pyc differ
diff --git a/test/bytecode_3.4/09_yield_from.pyc b/test/bytecode_3.4/09_yield_from.pyc
new file mode 100644
index 00000000..d2809716
Binary files /dev/null and b/test/bytecode_3.4/09_yield_from.pyc differ
diff --git a/test/simple_source/expression/09_yield_from.py b/test/simple_source/expression/09_yield_from.py
index a6dfebc9..e8d5eb20 100644
--- a/test/simple_source/expression/09_yield_from.py
+++ b/test/simple_source/expression/09_yield_from.py
@@ -11,6 +11,9 @@
 def _walk_dir(dir, dfile, ddir=None):
     yield from _walk_dir(dir, ddir=dfile)
 
+def ybug(g):
+    yield from g
+
 # From 3.5.1 _wakrefset.py
 #
 #  3.5:
diff --git a/uncompyle6/semantics/customize3.py b/uncompyle6/semantics/customize3.py
index 1a02056c..228766c1 100644
--- a/uncompyle6/semantics/customize3.py
+++ b/uncompyle6/semantics/customize3.py
@@ -193,12 +193,12 @@ def customize_for_version3(self, version):
         def n_yield_from(node):
             self.write('yield from')
             self.write(' ')
-            if 3.3 <= self.version <= 3.4:
+            if 3.3 == self.version:
                 self.preorder(node[0][0][0][0])
-            elif self.version >= 3.5:
+            elif self.version >= 3.4:
                 self.preorder(node[0])
             else:
-                assert False, "dunno about this python version"
+                assert False, "dunno how ths Python handles 'yield from'"
             self.prune() # stop recursing
         self.n_yield_from = n_yield_from