diff --git a/_test/extra.txt b/_test/extra.txt
index 561c42e..1ffadda 100644
--- a/_test/extra.txt
+++ b/_test/extra.txt
@@ -488,3 +488,11 @@ _a[b_c_](d)
 //- - - - - - - - -//
 <p>_a<a href="d">b_c_</a></p>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
+
+37: Tabs and spaces
+    OPTIONS: {"enableEscape": true}
+//- - - - - - - - -//
+\t\t x\n
+//- - - - - - - - -//
+<pre><code>\t x\n</code></pre>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
diff --git a/parser/fcode_block.go b/parser/fcode_block.go
index 2bb688f..7e44cec 100644
--- a/parser/fcode_block.go
+++ b/parser/fcode_block.go
@@ -87,8 +87,11 @@ func (b *fencedCodeBlockParser) Continue(node ast.Node, reader text.Reader, pc C
 			return Close
 		}
 	}
-	pos, padding := util.DedentPositionPadding(line, reader.LineOffset(), segment.Padding, fdata.indent)
-
+	pos, padding := util.IndentPositionPadding(line, reader.LineOffset(), segment.Padding, fdata.indent)
+	if pos < 0 {
+		pos = util.FirstNonSpacePosition(line)
+		padding = 0
+	}
 	seg := text.NewSegmentPadding(segment.Start+pos, segment.Stop, padding)
 	// if code block line starts with a tab, keep a tab as it is.
 	if padding != 0 {
diff --git a/util/util.go b/util/util.go
index 1af34b8..dc453be 100644
--- a/util/util.go
+++ b/util/util.go
@@ -151,30 +151,7 @@ func TabWidth(currentPos int) int {
 // width=2 is in the tab character. In this case, IndentPosition returns
 // (pos=1, padding=2)
 func IndentPosition(bs []byte, currentPos, width int) (pos, padding int) {
-	if width == 0 {
-		return 0, 0
-	}
-	w := 0
-	l := len(bs)
-	i := 0
-	hasTab := false
-	for ; i < l; i++ {
-		if bs[i] == '\t' {
-			w += TabWidth(currentPos + w)
-			hasTab = true
-		} else if bs[i] == ' ' {
-			w++
-		} else {
-			break
-		}
-	}
-	if w >= width {
-		if !hasTab {
-			return width, 0
-		}
-		return i, w - width
-	}
-	return -1, -1
+	return IndentPositionPadding(bs, currentPos, 0, width)
 }
 
 // IndentPositionPadding searches an indent position with the given width for the given line.
@@ -188,9 +165,9 @@ func IndentPositionPadding(bs []byte, currentPos, paddingv, width int) (pos, pad
 	i := 0
 	l := len(bs)
 	for ; i < l; i++ {
-		if bs[i] == '\t' {
+		if bs[i] == '\t' && w < width {
 			w += TabWidth(currentPos + w)
-		} else if bs[i] == ' ' {
+		} else if bs[i] == ' ' && w < width {
 			w++
 		} else {
 			break
@@ -202,55 +179,6 @@ func IndentPositionPadding(bs []byte, currentPos, paddingv, width int) (pos, pad
 	return -1, -1
 }
 
-// DedentPosition dedents lines by the given width.
-func DedentPosition(bs []byte, currentPos, width int) (pos, padding int) {
-	if width == 0 {
-		return 0, 0
-	}
-	w := 0
-	l := len(bs)
-	i := 0
-	for ; i < l; i++ {
-		if bs[i] == '\t' {
-			w += TabWidth(currentPos + w)
-		} else if bs[i] == ' ' {
-			w++
-		} else {
-			break
-		}
-	}
-	if w >= width {
-		return i, w - width
-	}
-	return i, 0
-}
-
-// DedentPositionPadding dedents lines by the given width.
-// This function is mostly same as DedentPosition except this function
-// takes account into additional paddings.
-func DedentPositionPadding(bs []byte, currentPos, paddingv, width int) (pos, padding int) {
-	if width == 0 {
-		return 0, paddingv
-	}
-
-	w := 0
-	i := 0
-	l := len(bs)
-	for ; i < l; i++ {
-		if bs[i] == '\t' {
-			w += TabWidth(currentPos + w)
-		} else if bs[i] == ' ' {
-			w++
-		} else {
-			break
-		}
-	}
-	if w >= width {
-		return i - paddingv, w - width
-	}
-	return i - paddingv, 0
-}
-
 // IndentWidth calculate an indent width for the given line.
 func IndentWidth(bs []byte, currentPos int) (width, pos int) {
 	l := len(bs)