diff --git a/markdown.go b/markdown.go
index 06dddcf..2fcafec 100644
--- a/markdown.go
+++ b/markdown.go
@@ -31,7 +31,7 @@ const (
 	// rebuild it using
 	//	make nuke
 	//	make parser
-	needParserIfaceVersion = parserIfaceVersion_1
+	needParserIfaceVersion = parserIfaceVersion_2
 )
 
 // Markdown Options:
diff --git a/parser.leg b/parser.leg
index 3929c43..0fbcbf0 100644
--- a/parser.leg
+++ b/parser.leg
@@ -28,7 +28,7 @@ import (
 )
 
 const (
-	parserIfaceVersion_1 = iota
+	parserIfaceVersion_2 = iota
 )
 
 // Semantic value of a parsing action.
@@ -153,11 +153,11 @@ SetextBottom1 = "===" '='* Newline
 SetextBottom2 = "---" '-'* Newline
 
 SetextHeading1 =  &(RawLine SetextBottom1)
-                  a:StartList ( !Endline Inline { a = cons($$, a) } )+ Newline
+                  a:StartList ( !Endline Inline { a = cons($$, a) } )+ Sp? Newline
                   SetextBottom1 { $$ = p.mkList(H1, a) }
 
 SetextHeading2 =  &(RawLine SetextBottom2)
-                  a:StartList ( !Endline Inline { a = cons($$, a) } )+ Newline
+                  a:StartList ( !Endline Inline { a = cons($$, a) } )+ Sp? Newline
                   SetextBottom2 { $$ = p.mkList(H2, a) }
 
 Heading = AtxHeading | SetextHeading