diff --git a/src/eval.c b/src/eval.c
index 71bd353701..488818a4b0 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -5417,14 +5417,9 @@ eval9_leader(
 		}
 		if (rettv->v_type == VAR_FLOAT)
 		{
-		    if (vim9script)
-		    {
-			rettv->v_type = VAR_BOOL;
-			val = f == 0.0 ? VVAL_TRUE : VVAL_FALSE;
-			type = VAR_BOOL;
-		    }
-		    else
-			f = !f;
+		    rettv->v_type = VAR_BOOL;
+		    val = f == 0.0 ? VVAL_TRUE : VVAL_FALSE;
+		    type = VAR_BOOL;
 		}
 		else
 		{
diff --git a/src/testdir/test_vimscript.vim b/src/testdir/test_vimscript.vim
index 0be53dc5a3..a79c682791 100644
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -7086,7 +7086,11 @@ func Test_compound_assignment_operators()
     call assert_fails('let x %= 0.5', 'E734:')
     call assert_fails('let x .= "f"', 'E734:')
     let x = !3.14
-    call assert_equal(0.0, x)
+    call assert_equal(0, x)
+    call assert_equal(1, !!1.0)
+    let x = !0.0
+    call assert_equal(1, x)
+    call assert_equal(0, !!0.0)
 
     " integer and float operations
     let x = 1
diff --git a/src/version.c b/src/version.c
index 78ae26eef0..5dc95056bb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2123,
 /**/
     2122,
 /**/