diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index b7897fe7cb..156d244629 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -2300,12 +2300,29 @@ def Test_expr7_parens_vim9script()
   CheckScriptSuccess(lines)
 enddef
 
-def Test_expr7_negate()
+def Test_expr7_negate_add()
   assert_equal(-99, -99)
+  assert_equal(-99, - 99)
   assert_equal(99, --99)
+  assert_equal(99, -- 99)
+  assert_equal(99, - - 99)
+  assert_equal(99, +99)
+  assert_equal(-99, -+99)
+  assert_equal(-99, -+ 99)
+  assert_equal(-99, - +99)
+  assert_equal(-99, - + 99)
+  assert_equal(-99, +-99)
+  assert_equal(-99, + -99)
+  assert_equal(-99, + - 99)
+
   var nr = 88
   assert_equal(-88, -nr)
-  assert_equal(88, --nr)
+  assert_equal(-88, - nr)
+  assert_equal(-88, - +nr)
+  assert_equal(88, -- nr)
+  assert_equal(88, + nr)
+  assert_equal(88, --+ nr)
+  assert_equal(88, - - nr)
 enddef
 
 def Echo(arg: any): string
diff --git a/src/version.c b/src/version.c
index 0f0ccda25a..3f5cd797cf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2013,
 /**/
     2012,
 /**/
diff --git a/src/vim9compile.c b/src/vim9compile.c
index c5d92aa1b8..2c522809d9 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -3362,6 +3362,8 @@ compile_leader(cctx_T *cctx, int numeric_only, char_u *start, char_u **end)
     while (p > start)
     {
 	--p;
+	while (VIM_ISWHITE(*p))
+	    --p;
 	if (*p == '-' || *p == '+')
 	{
 	    int	    negate = *p == '-';