diff --git a/Misc/NEWS b/Misc/NEWS
index a92164b9d71..81adc944bba 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -176,6 +176,9 @@ Library
 Extension Modules
 -----------------
 
+- Issue #5881: Remove old undocumented compatibility interfaces in hashlib and
+  pwd.
+
 - Issue #5463: In struct module, remove deprecated float coercion
   for integer type codes: struct.pack('L', 0.3) should now raise
   an error.  The _PY_STRUCT_FLOAT_COERCE constant has been removed.
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 0dae5158d51..ae743946b16 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -281,12 +281,6 @@ static PyGetSetDef EVP_getseters[] = {
      (getter)EVP_get_block_size, NULL,
      NULL,
      NULL},
-    /* the old md5 and sha modules support 'digest_size' as in PEP 247.
-     * the old sha module also supported 'digestsize'.  ugh. */
-    {"digestsize",
-     (getter)EVP_get_digest_size, NULL,
-     NULL,
-     NULL},
     {NULL}  /* Sentinel */
 };
 
diff --git a/Modules/pwdmodule.c b/Modules/pwdmodule.c
index cb99183f27c..061a0a5254f 100644
--- a/Modules/pwdmodule.c
+++ b/Modules/pwdmodule.c
@@ -203,13 +203,12 @@ PyInit_pwd(void)
 	if (m == NULL)
     		return NULL;
 
-	if (!initialized)
+	if (!initialized) {
 		PyStructSequence_InitType(&StructPwdType, 
 					  &struct_pwd_type_desc);
+		initialized = 1;
+	}
 	Py_INCREF((PyObject *) &StructPwdType);
 	PyModule_AddObject(m, "struct_passwd", (PyObject *) &StructPwdType);
-	/* And for b/w compatibility (this was defined by mistake): */
-	PyModule_AddObject(m, "struct_pwent", (PyObject *) &StructPwdType);
-	initialized = 1;
 	return m;
 }
diff --git a/Modules/sha256module.c b/Modules/sha256module.c
index 7c9b58d400d..a9ac748b62e 100644
--- a/Modules/sha256module.c
+++ b/Modules/sha256module.c
@@ -533,9 +533,6 @@ static PyGetSetDef SHA_getseters[] = {
 
 static PyMemberDef SHA_members[] = {
     {"digest_size", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
-    /* the old md5 and sha modules support 'digest_size' as in PEP 247.
-     * the old sha module also supported 'digestsize'.  ugh. */
-    {"digestsize", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
     {NULL}  /* Sentinel */
 };
 
diff --git a/Modules/sha512module.c b/Modules/sha512module.c
index 387187f631d..e29ddecbf85 100644
--- a/Modules/sha512module.c
+++ b/Modules/sha512module.c
@@ -599,9 +599,6 @@ static PyGetSetDef SHA_getseters[] = {
 
 static PyMemberDef SHA_members[] = {
     {"digest_size", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
-    /* the old md5 and sha modules support 'digest_size' as in PEP 247.
-     * the old sha module also supported 'digestsize'.  ugh. */
-    {"digestsize", T_INT, offsetof(SHAobject, digestsize), READONLY, NULL},
     {NULL}  /* Sentinel */
 };