diff --git a/src/testdir/test_startup.vim b/src/testdir/test_startup.vim
index b20954b..d67bfb7 100644
--- a/src/testdir/test_startup.vim
+++ b/src/testdir/test_startup.vim
@@ -536,11 +536,11 @@
       " Depending on the GUI library and the windowing system the final size
       " might be a bit different, allow for some tolerance.  Tuned based on
       " actual failures.
-      call assert_inrange(31, 35, lines[0])
-      call assert_equal(13, lines[1])
-      call assert_equal(41, lines[2])
-      call assert_equal(43, lines[3])
-      call assert_equal([41, 43], lines[4])
+      call assert_inrange(31, 35, str2nr(lines[0]))
+      call assert_equal('13', lines[1])
+      call assert_equal('41', lines[2])
+      call assert_equal('43', lines[3])
+      call assert_equal('[41, 43]', lines[4])
     endif
   endif