diff -r b7a4c076ba40 Lib/test/test_extcall.py
--- a/Lib/test/test_extcall.py	Tue Jun 07 01:08:48 2016 +0000
+++ b/Lib/test/test_extcall.py	Fri Jun 10 16:14:52 2016 +0300
@@ -57,6 +57,10 @@ Here we add keyword arguments
     Traceback (most recent call last):
         ...
     TypeError: f() got multiple values for keyword argument 'a'
+    >>> f(1, 2, a=3, **{'a': 4}, **{'a': 5})
+    Traceback (most recent call last):
+        ...
+    TypeError: f() got multiple values for keyword argument 'a'
     >>> f(1, 2, 3, *[4, 5], **{'a':6, 'b':7})
     (1, 2, 3, 4, 5) {'a': 6, 'b': 7}
     >>> f(1, 2, 3, x=4, y=5, *(6, 7), **{'a':8, 'b': 9})
diff -r b7a4c076ba40 Lib/test/test_unpack_ex.py
--- a/Lib/test/test_unpack_ex.py	Tue Jun 07 01:08:48 2016 +0000
+++ b/Lib/test/test_unpack_ex.py	Fri Jun 10 16:14:52 2016 +0300
@@ -248,6 +248,11 @@ Overridden parameters
       ...
     TypeError: f() got multiple values for keyword argument 'x'
 
+    >>> f(x=5, **{'x': 3}, **{'x': 2})
+    Traceback (most recent call last):
+      ...
+    TypeError: f() got multiple values for keyword argument 'x'
+
     >>> f(**{1: 3}, **{1: 5})
     Traceback (most recent call last):
       ...
diff -r b7a4c076ba40 Python/compile.c
--- a/Python/compile.c	Tue Jun 07 01:08:48 2016 +0000
+++ b/Python/compile.c	Fri Jun 10 16:14:52 2016 +0300
@@ -3360,7 +3360,7 @@ compiler_call_helper(struct compiler *c,
         code |= 2;
         if (nsubkwargs > 1) {
             /* Pack it all up */
-            int function_pos = n + (code & 1) + nkw + 1;
+            int function_pos = n + (code & 1) + 2*nkw + 1;
             ADDOP_I(c, BUILD_MAP_UNPACK_WITH_CALL, nsubkwargs | (function_pos << 8));
         }
     }