diff --git a/src/eval.c b/src/eval.c
index 7ce739c..1c2bd61 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -9216,6 +9216,9 @@
     int		error = FALSE;
     garray_T	ga;
 
+    if (argvars[0].v_type == VAR_SPECIAL
+	    && argvars[0].vval.v_number == (isTrue ? VVAL_TRUE : VV_FALSE))
+	return;
     if (argvars[0].v_type != VAR_NUMBER
 	    || (get_tv_number_chk(&argvars[0], &error) == 0) == isTrue
 	    || error)
diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
index 22046e2..6d2f800 100644
--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -2,11 +2,13 @@
 
 func Test_assert_false()
   call assert_false(0)
+  call assert_false(v:false)
 endfunc
 
 func Test_assert_true()
   call assert_true(1)
   call assert_true(123)
+  call assert_true(v:true)
 endfunc
 
 func Test_assert_equal()
diff --git a/src/version.c b/src/version.c
index 74518d9..471bd34 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1271,
+/**/
     1270,
 /**/
     1269,