diff --git a/src/unicode/maketables.go b/src/unicode/maketables.go
index 9fccdecafaed6..e0110c9536d11 100644
--- a/src/unicode/maketables.go
+++ b/src/unicode/maketables.go
@@ -261,9 +261,6 @@ func parseCategory(line string) (state State) {
 		logger.Fatalf("%.5s...: %s", line, err)
 	}
 	lastChar = rune(point)
-	if point == 0 {
-		return // not interesting and we use 0 as unset
-	}
 	if point > MaxChar {
 		return
 	}
diff --git a/src/unicode/tables.go b/src/unicode/tables.go
index 370a9d1174d7b..8bb42062f9ed8 100644
--- a/src/unicode/tables.go
+++ b/src/unicode/tables.go
@@ -53,7 +53,7 @@ var Categories = map[string]*RangeTable{
 
 var _C = &RangeTable{
 	R16: []Range16{
-		{0x0001, 0x001f, 1},
+		{0x0000, 0x001f, 1},
 		{0x007f, 0x009f, 1},
 		{0x00ad, 0x0600, 1363},
 		{0x0601, 0x0605, 1},
@@ -81,7 +81,7 @@ var _C = &RangeTable{
 
 var _Cc = &RangeTable{
 	R16: []Range16{
-		{0x0001, 0x001f, 1},
+		{0x0000, 0x001f, 1},
 		{0x007f, 0x009f, 1},
 	},
 	LatinOffset: 2,