diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index 205b8bbdaba..871fbed1d80 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -864,63 +864,63 @@ extern DL_IMPORT(int) PyUnicode_Contains(
 */
 
 extern DL_IMPORT(int) _PyUnicode_IsLowercase(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsUppercase(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsTitlecase(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsWhitespace(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsLinebreak(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(Py_UNICODE) _PyUnicode_ToLowercase(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(Py_UNICODE) _PyUnicode_ToUppercase(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(Py_UNICODE) _PyUnicode_ToTitlecase(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_ToDecimalDigit(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_ToDigit(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(double) _PyUnicode_ToNumeric(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsDecimalDigit(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsDigit(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsNumeric(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 extern DL_IMPORT(int) _PyUnicode_IsAlpha(
-    register const Py_UNICODE ch 	/* Unicode character */
+    Py_UNICODE ch 	/* Unicode character */
     );
 
 #ifdef __cplusplus
diff --git a/Objects/unicodectype.c b/Objects/unicodectype.c
index c1b5a0d4122..18c9a89a8ab 100644
--- a/Objects/unicodectype.c
+++ b/Objects/unicodectype.c
@@ -49,7 +49,7 @@ gettyperecord(Py_UNICODE code)
 /* Returns 1 for Unicode characters having the category 'Zl' or type
    'B', 0 otherwise. */
 
-int _PyUnicode_IsLinebreak(register const Py_UNICODE ch)
+int _PyUnicode_IsLinebreak(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -79,7 +79,7 @@ Py_UNICODE _PyUnicode_ToTitlecase(register Py_UNICODE ch)
 /* Returns 1 for Unicode characters having the category 'Lt', 0
    otherwise. */
 
-int _PyUnicode_IsTitlecase(register const Py_UNICODE ch)
+int _PyUnicode_IsTitlecase(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -89,14 +89,14 @@ int _PyUnicode_IsTitlecase(register const Py_UNICODE ch)
 /* Returns the integer decimal (0-9) for Unicode characters having
    this property, -1 otherwise. */
 
-int _PyUnicode_ToDecimalDigit(register const Py_UNICODE ch)
+int _PyUnicode_ToDecimalDigit(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
     return (ctype->flags & DECIMAL_MASK) ? ctype->decimal : -1;
 }
 
-int _PyUnicode_IsDecimalDigit(register const Py_UNICODE ch)
+int _PyUnicode_IsDecimalDigit(Py_UNICODE ch)
 {
     if (_PyUnicode_ToDecimalDigit(ch) < 0)
 	return 0;
@@ -106,14 +106,14 @@ int _PyUnicode_IsDecimalDigit(register const Py_UNICODE ch)
 /* Returns the integer digit (0-9) for Unicode characters having
    this property, -1 otherwise. */
 
-int _PyUnicode_ToDigit(register const Py_UNICODE ch)
+int _PyUnicode_ToDigit(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
     return (ctype->flags & DIGIT_MASK) ? ctype->digit : -1;
 }
 
-int _PyUnicode_IsDigit(register const Py_UNICODE ch)
+int _PyUnicode_IsDigit(Py_UNICODE ch)
 {
     if (_PyUnicode_ToDigit(ch) < 0)
 	return 0;
@@ -125,7 +125,7 @@ int _PyUnicode_IsDigit(register const Py_UNICODE ch)
 
 /* TODO: replace with unicodetype_db.h table */
 
-double _PyUnicode_ToNumeric(register const Py_UNICODE ch)
+double _PyUnicode_ToNumeric(Py_UNICODE ch)
 {
     switch (ch) {
     case 0x3007:
@@ -313,7 +313,7 @@ double _PyUnicode_ToNumeric(register const Py_UNICODE ch)
     }
 }
 
-int _PyUnicode_IsNumeric(register const Py_UNICODE ch)
+int _PyUnicode_IsNumeric(Py_UNICODE ch)
 {
     if (_PyUnicode_ToNumeric(ch) < 0.0)
 	return 0;
@@ -325,7 +325,7 @@ int _PyUnicode_IsNumeric(register const Py_UNICODE ch)
 /* Returns 1 for Unicode characters having the bidirectional type
    'WS', 'B' or 'S' or the category 'Zs', 0 otherwise. */
 
-int _PyUnicode_IsWhitespace(register const Py_UNICODE ch)
+int _PyUnicode_IsWhitespace(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -335,7 +335,7 @@ int _PyUnicode_IsWhitespace(register const Py_UNICODE ch)
 /* Returns 1 for Unicode characters having the category 'Ll', 0
    otherwise. */
 
-int _PyUnicode_IsLowercase(register const Py_UNICODE ch)
+int _PyUnicode_IsLowercase(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -345,7 +345,7 @@ int _PyUnicode_IsLowercase(register const Py_UNICODE ch)
 /* Returns 1 for Unicode characters having the category 'Lu', 0
    otherwise. */
 
-int _PyUnicode_IsUppercase(register const Py_UNICODE ch)
+int _PyUnicode_IsUppercase(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -355,7 +355,7 @@ int _PyUnicode_IsUppercase(register const Py_UNICODE ch)
 /* Returns the uppercase Unicode characters corresponding to ch or just
    ch if no uppercase mapping is known. */
 
-Py_UNICODE _PyUnicode_ToUppercase(register Py_UNICODE ch)
+Py_UNICODE _PyUnicode_ToUppercase(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -371,7 +371,7 @@ Py_UNICODE _PyUnicode_ToUppercase(register Py_UNICODE ch)
 /* Returns the lowercase Unicode characters corresponding to ch or just
    ch if no lowercase mapping is known. */
 
-Py_UNICODE _PyUnicode_ToLowercase(register Py_UNICODE ch)
+Py_UNICODE _PyUnicode_ToLowercase(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -387,7 +387,7 @@ Py_UNICODE _PyUnicode_ToLowercase(register Py_UNICODE ch)
 /* Returns 1 for Unicode characters having the category 'Ll', 'Lu', 'Lt',
    'Lo' or 'Lm',  0 otherwise. */
 
-int _PyUnicode_IsAlpha(register const Py_UNICODE ch)
+int _PyUnicode_IsAlpha(Py_UNICODE ch)
 {
     const _PyUnicode_TypeRecord *ctype = gettyperecord(ch);
 
@@ -399,32 +399,32 @@ int _PyUnicode_IsAlpha(register const Py_UNICODE ch)
 /* Export the interfaces using the wchar_t type for portability
    reasons:  */
 
-int _PyUnicode_IsWhitespace(register const Py_UNICODE ch)
+int _PyUnicode_IsWhitespace(Py_UNICODE ch)
 {
     return iswspace(ch);
 }
 
-int _PyUnicode_IsLowercase(register const Py_UNICODE ch)
+int _PyUnicode_IsLowercase(Py_UNICODE ch)
 {
     return iswlower(ch);
 }
 
-int _PyUnicode_IsUppercase(register const Py_UNICODE ch)
+int _PyUnicode_IsUppercase(Py_UNICODE ch)
 {
     return iswupper(ch);
 }
 
-Py_UNICODE _PyUnicode_ToLowercase(register const Py_UNICODE ch)
+Py_UNICODE _PyUnicode_ToLowercase(Py_UNICODE ch)
 {
     return towlower(ch);
 }
 
-Py_UNICODE _PyUnicode_ToUppercase(register const Py_UNICODE ch)
+Py_UNICODE _PyUnicode_ToUppercase(Py_UNICODE ch)
 {
     return towupper(ch);
 }
 
-int _PyUnicode_IsAlpha(register const Py_UNICODE ch)
+int _PyUnicode_IsAlpha(Py_UNICODE ch)
 {
     return iswalpha(ch);
 }