diff --git a/src/bytes/bytes.go b/src/bytes/bytes.go
index 437a6e12df..77a7ce98e0 100644
--- a/src/bytes/bytes.go
+++ b/src/bytes/bytes.go
@@ -489,19 +489,19 @@ func ToTitle(s []byte) []byte { return Map(unicode.ToTitle, s) }
 // ToUpperSpecial treats s as UTF-8-encoded bytes and returns a copy with all the Unicode letters mapped to their
 // upper case, giving priority to the special casing rules.
 func ToUpperSpecial(c unicode.SpecialCase, s []byte) []byte {
-	return Map(func(r rune) rune { return c.ToUpper(r) }, s)
+	return Map(c.ToUpper, s)
 }
 
 // ToLowerSpecial treats s as UTF-8-encoded bytes and returns a copy with all the Unicode letters mapped to their
 // lower case, giving priority to the special casing rules.
 func ToLowerSpecial(c unicode.SpecialCase, s []byte) []byte {
-	return Map(func(r rune) rune { return c.ToLower(r) }, s)
+	return Map(c.ToLower, s)
 }
 
 // ToTitleSpecial treats s as UTF-8-encoded bytes and returns a copy with all the Unicode letters mapped to their
 // title case, giving priority to the special casing rules.
 func ToTitleSpecial(c unicode.SpecialCase, s []byte) []byte {
-	return Map(func(r rune) rune { return c.ToTitle(r) }, s)
+	return Map(c.ToTitle, s)
 }
 
 // isSeparator reports whether the rune could mark a word boundary.
diff --git a/src/strings/strings.go b/src/strings/strings.go
index e54f0c2bfa..97d83cfde1 100644
--- a/src/strings/strings.go
+++ b/src/strings/strings.go
@@ -606,19 +606,19 @@ func ToTitle(s string) string { return Map(unicode.ToTitle, s) }
 // ToUpperSpecial returns a copy of the string s with all Unicode letters mapped to their
 // upper case using the case mapping specified by c.
 func ToUpperSpecial(c unicode.SpecialCase, s string) string {
-	return Map(func(r rune) rune { return c.ToUpper(r) }, s)
+	return Map(c.ToUpper, s)
 }
 
 // ToLowerSpecial returns a copy of the string s with all Unicode letters mapped to their
 // lower case using the case mapping specified by c.
 func ToLowerSpecial(c unicode.SpecialCase, s string) string {
-	return Map(func(r rune) rune { return c.ToLower(r) }, s)
+	return Map(c.ToLower, s)
 }
 
 // ToTitleSpecial returns a copy of the string s with all Unicode letters mapped to their
 // title case, giving priority to the special casing rules.
 func ToTitleSpecial(c unicode.SpecialCase, s string) string {
-	return Map(func(r rune) rune { return c.ToTitle(r) }, s)
+	return Map(c.ToTitle, s)
 }
 
 // isSeparator reports whether the rune could mark a word boundary.