diff --git a/test/ruby/test_integer.rb b/test/ruby/test_integer.rb
index 963c6b75a4..db478276c5 100644
--- a/test/ruby/test_integer.rb
+++ b/test/ruby/test_integer.rb
@@ -490,15 +490,12 @@ class TestInteger < Test::Unit::TestCase
     end
 
     bug13440 = '[ruby-core:80696] [Bug #13440]'
-    too_big = []
-    too_small = []
-    0.step(to: 50, by: 0.001) do |i|
+    failures = []
+    0.step(to: 50, by: 0.05) do |i|
       n = (10**i).to_i
-      int_root = Integer.sqrt(n)
-      too_big   << n  if int_root*int_root > n
-      too_small << n  if (int_root+1)*(int_root+1) <= n
+      root = Integer.sqrt(n)
+      failures << n  unless root*root <= n && (root+1)*(root+1) > n
     end
-    assert_empty(too_big, bug13440)
-    assert_empty(too_small, bug13440)
+    assert_empty(failures, bug13440)
   end
 end