diff --git a/Misc/NEWS.d/next/Core and Builtins/2021-05-12-14-26-16.bpo-44114.p-WfAE.rst b/Misc/NEWS.d/next/Core and Builtins/2021-05-12-14-26-16.bpo-44114.p-WfAE.rst
new file mode 100644
index 00000000000000..c50b1594cae356
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2021-05-12-14-26-16.bpo-44114.p-WfAE.rst	
@@ -0,0 +1 @@
+Fix incorrect dictkeys_reversed and dictitems_reversed function signatures in C code, which broke webassembly builds.
\ No newline at end of file
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 9e2c12229df802..90507d8e400168 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -4826,7 +4826,7 @@ static PySequenceMethods dictitems_as_sequence = {
     (objobjproc)dictitems_contains,     /* sq_contains */
 };
 
-static PyObject* dictitems_reversed(_PyDictViewObject *dv);
+static PyObject* dictitems_reversed(_PyDictViewObject *dv, PyObject *Py_UNUSED(ignored));
 
 PyDoc_STRVAR(reversed_items_doc,
 "Return a reverse iterator over the dict items.");
@@ -4879,7 +4879,7 @@ dictitems_new(PyObject *dict, PyObject *Py_UNUSED(ignored))
 }
 
 static PyObject *
-dictitems_reversed(_PyDictViewObject *dv)
+dictitems_reversed(_PyDictViewObject *dv, PyObject *Py_UNUSED(ignored))
 {
     if (dv->dv_dict == NULL) {
         Py_RETURN_NONE;
@@ -4909,7 +4909,7 @@ static PySequenceMethods dictvalues_as_sequence = {
     (objobjproc)0,                      /* sq_contains */
 };
 
-static PyObject* dictvalues_reversed(_PyDictViewObject *dv);
+static PyObject* dictvalues_reversed(_PyDictViewObject *dv, PyObject *Py_UNUSED(ignored));
 
 PyDoc_STRVAR(reversed_values_doc,
 "Return a reverse iterator over the dict values.");
@@ -4960,7 +4960,7 @@ dictvalues_new(PyObject *dict, PyObject *Py_UNUSED(ignored))
 }
 
 static PyObject *
-dictvalues_reversed(_PyDictViewObject *dv)
+dictvalues_reversed(_PyDictViewObject *dv, PyObject *Py_UNUSED(ignored))
 {
     if (dv->dv_dict == NULL) {
         Py_RETURN_NONE;