diff --git a/src/librustc_ast_pretty/pprust.rs b/src/librustc_ast_pretty/pprust.rs
index b0edb1ca41d20..4b228629ad719 100644
--- a/src/librustc_ast_pretty/pprust.rs
+++ b/src/librustc_ast_pretty/pprust.rs
@@ -450,7 +450,9 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     fn print_comment(&mut self, cmnt: &comments::Comment) {
         match cmnt.style {
             comments::Mixed => {
-                self.zerobreak();
+                if !self.is_beginning_of_line() {
+                    self.zerobreak();
+                }
                 if let Some((last, lines)) = cmnt.lines.split_last() {
                     self.ibox(0);
 
diff --git a/src/test/pretty/block-comment-wchar.pp b/src/test/pretty/block-comment-wchar.pp
index 9317b36ba497b..2bfcdd75e15cf 100644
--- a/src/test/pretty/block-comment-wchar.pp
+++ b/src/test/pretty/block-comment-wchar.pp
@@ -73,7 +73,6 @@
     */
 
 
-
     /* */
 
     /*
@@ -81,7 +80,6 @@
       Space 6+2:                     compare A
       Ogham Space Mark 6+2: compare B
     */
-
     /* */
 
     /*