diff --git a/src/eval.c b/src/eval.c
index 9a9110e..307a2ae 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1913,7 +1913,7 @@
 	    && evalarg != NULL
 	    && (evalarg->eval_cookie != NULL || evalarg->eval_cctx != NULL)
 	    && (*arg == NUL || (VIM_ISWHITE(arg[-1])
-					     && *arg == '#' && arg[1] != '{')))
+						  && vim9_comment_start(arg))))
     {
 	char_u *p;
 
diff --git a/src/proto/vim9compile.pro b/src/proto/vim9compile.pro
index fb37923..30f7bbf 100644
--- a/src/proto/vim9compile.pro
+++ b/src/proto/vim9compile.pro
@@ -11,6 +11,7 @@
 char *type_name(type_T *type, char **tofree);
 int get_script_item_idx(int sid, char_u *name, int check_writable);
 imported_T *find_imported(char_u *name, size_t len, cctx_T *cctx);
+int vim9_comment_start(char_u *p);
 char_u *peek_next_line_from_context(cctx_T *cctx);
 char_u *next_line_from_context(cctx_T *cctx, int skip_comment);
 char_u *to_name_const_end(char_u *arg);
diff --git a/src/scriptfile.c b/src/scriptfile.c
index 4e7df4d..5514573 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -1763,10 +1763,13 @@
 	// backslash. We always need to read the next line, keep it in
 	// sp->nextline.
 	/* Also check for a comment in between continuation lines: "\ */
+	// Also check for a Vim9 comment and empty line.
 	sp->nextline = get_one_sourceline(sp);
 	if (sp->nextline != NULL
 		&& (*(p = skipwhite(sp->nextline)) == '\\'
-			      || (p[0] == '"' && p[1] == '\\' && p[2] == ' ')))
+			      || (p[0] == '"' && p[1] == '\\' && p[2] == ' ')
+			      || (in_vim9script()
+				  && (*p == NUL || vim9_comment_start(p)))))
 	{
 	    garray_T    ga;
 
@@ -1794,8 +1797,11 @@
 		    }
 		    ga_concat(&ga, p + 1);
 		}
-		else if (p[0] != '"' || p[1] != '\\' || p[2] != ' ')
+		else if (!(p[0] == '"' && p[1] == '\\' && p[2] == ' ')
+			&& !(in_vim9script()
+				      && (*p == NUL || vim9_comment_start(p))))
 		    break;
+		/* drop a # comment or "\ comment line */
 	    }
 	    ga_append(&ga, NUL);
 	    vim_free(line);
diff --git a/src/version.c b/src/version.c
index 2e8f423..fb8fbe3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1243,
+/**/
     1242,
 /**/
     1241,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 81d5324..ed40076 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2463,7 +2463,7 @@
 /*
  * Return TRUE if "p" points at a "#" but not at "#{".
  */
-    static int
+    int
 vim9_comment_start(char_u *p)
 {
     return p[0] == '#' && p[1] != '{';