diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 1e9b5e9fa2b..bcc65f9b6c0 100755
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -2805,6 +2805,9 @@ def parse_indexed_fused_cdef(self, env):
             self.is_fused_index = False
             return
 
+        for i, type in enumerate(specific_types):
+            specific_types[i] = type.specialize_fused(env)
+
         fused_types = base_type.get_fused_types()
         if len(specific_types) > len(fused_types):
             return error(self.pos, "Too many types specified")
diff --git a/Cython/Compiler/PyrexTypes.py b/Cython/Compiler/PyrexTypes.py
index e0703a13b30..5279a416377 100755
--- a/Cython/Compiler/PyrexTypes.py
+++ b/Cython/Compiler/PyrexTypes.py
@@ -57,6 +57,12 @@ def get_fused_types(self, result=None, seen=None, subtypes=None):
 
         return None
 
+    def specialize_fused(self, env):
+        if env.fused_to_specific:
+            return self.specialize(env.fused_to_specific)
+
+        return self
+
     def _get_fused_types(self):
         """
         Add this indirection for the is_fused property to allow overriding
diff --git a/tests/run/fused_types.pyx b/tests/run/fused_types.pyx
index 53e731599c5..c452157476a 100644
--- a/tests/run/fused_types.pyx
+++ b/tests/run/fused_types.pyx
@@ -282,3 +282,18 @@ def test_cython_numeric(cython.numeric arg):
     double complex (10+1j)
     """
     print cython.typeof(arg), arg
+
+cdef fused ints_t:
+    int
+    long
+
+cdef _test_index_fused_args(cython.floating f, ints_t i):
+    print cython.typeof(f), cython.typeof(i)
+
+def test_index_fused_args(cython.floating f, ints_t i):
+    """
+    >>> import cython
+    >>> test_index_fused_args[cython.double, cython.int](2.0, 3)
+    double int
+    """
+    _test_index_fused_args[cython.floating, ints_t](f, i)