diff --git a/parser/pageparser/pagelexer.go b/parser/pageparser/pagelexer.go
index 612fb75f4..a1a1b5de6 100644
--- a/parser/pageparser/pagelexer.go
+++ b/parser/pageparser/pagelexer.go
@@ -248,7 +248,7 @@ func (l *pageLexer) consumeCRLF() bool {
 func (l *pageLexer) consumeToSpace() {
 	for {
 		r := l.next()
-		if r == eof || unicode.IsSpace(r) {
+		if r == eof || isASCIISpace(r) {
 			l.backup()
 			return
 		}
@@ -258,7 +258,7 @@ func (l *pageLexer) consumeToSpace() {
 func (l *pageLexer) consumeSpace() {
 	for {
 		r := l.next()
-		if r == eof || !unicode.IsSpace(r) {
+		if r == eof || !isASCIISpace(r) {
 			l.backup()
 			return
 		}
@@ -497,7 +497,7 @@ func minIndex(indices ...int) int {
 
 func indexNonWhiteSpace(s []byte, in rune) int {
 	idx := bytes.IndexFunc(s, func(r rune) bool {
-		return !unicode.IsSpace(r)
+		return !isASCIISpace(r)
 	})
 
 	if idx == -1 {
@@ -511,8 +511,12 @@ func indexNonWhiteSpace(s []byte, in rune) int {
 	return -1
 }
 
-func isSpace(r rune) bool {
-	return r == ' ' || r == '\t'
+func isASCIISpace(r rune) bool {
+	switch r {
+	case '\t', '\n', '\v', '\f', '\r', ' ':
+		return true
+	}
+	return false
 }
 
 func isAlphaNumericOrHyphen(r rune) bool {
diff --git a/parser/pageparser/pagelexer_intro.go b/parser/pageparser/pagelexer_intro.go
index a68a9e03a..03bd4c887 100644
--- a/parser/pageparser/pagelexer_intro.go
+++ b/parser/pageparser/pagelexer_intro.go
@@ -32,7 +32,7 @@ LOOP:
 			return lexFrontMatterOrgMode
 		case r == byteOrderMark:
 			l.emit(TypeIgnore)
-		case !isSpace(r) && !isEndOfLine(r):
+		case !isASCIISpace(r) && !isEndOfLine(r):
 			break LOOP
 		}
 	}
diff --git a/parser/pageparser/pagelexer_shortcode.go b/parser/pageparser/pagelexer_shortcode.go
index eb1b0bf73..15e9ead80 100644
--- a/parser/pageparser/pagelexer_shortcode.go
+++ b/parser/pageparser/pagelexer_shortcode.go
@@ -290,7 +290,7 @@ func lexEndOfShortcode(l *pageLexer) stateFunc {
 		return lexShortcodeRightDelim
 	}
 	switch r := l.next(); {
-	case isSpace(r):
+	case isASCIISpace(r):
 		l.ignore()
 	default:
 		return l.errorf("unclosed shortcode")
@@ -307,7 +307,7 @@ func lexInsideShortcode(l *pageLexer) stateFunc {
 	case r == eof:
 		// eol is allowed inside shortcodes; this may go to end of document before it fails
 		return l.errorf("unclosed shortcode action")
-	case isSpace(r), isEndOfLine(r):
+	case isASCIISpace(r):
 		l.ignore()
 	case r == '=':
 		l.consumeSpace()
diff --git a/parser/pageparser/pageparser_test.go b/parser/pageparser/pageparser_test.go
index 561ad7ea2..3407a3704 100644
--- a/parser/pageparser/pageparser_test.go
+++ b/parser/pageparser/pageparser_test.go
@@ -138,3 +138,13 @@ func TestSummaryDividerStartingFromMain(t *testing.T) {
 	c.Assert(items, qt.HasLen, 4)
 	c.Assert(items[1].Type, qt.Equals, TypeLeadSummaryDivider)
 }
+
+func TestIdeographicAfterSummaryDivider(t *testing.T) {
+	c := qt.New(t)
+
+	input := []byte(`aaa <!--more-->   　bbb`)
+	items, err := collectStringMain(string(input))
+	c.Assert(err, qt.IsNil)
+	c.Assert(items, qt.HasLen, 4)
+	c.Assert(items[2].ValStr(input), qt.Equals, "\u3000bbb")
+}