diff --git a/spec/dsl/sample_example_group_builder_spec.cr b/spec/dsl/sample_example_group_builder_spec.cr
index 6fedcc2..a5a9d88 100644
--- a/spec/dsl/sample_example_group_builder_spec.cr
+++ b/spec/dsl/sample_example_group_builder_spec.cr
@@ -291,7 +291,7 @@ describe Spectator::DSL::SampleExampleGroupBuilder do
       factory = Spectator::DSL::ExampleFactory.new(SpyExample)
       symbol = :test
       count = 3
-      expected = Array.new(SAMPLE_VALUES_COLLECTION.size * count) { |i| SAMPLE_VALUES_COLLECTION[i / count] }
+      expected = Array.new(SAMPLE_VALUES_COLLECTION.size * count) { |i| SAMPLE_VALUES_COLLECTION[i // count] }
       create_proc = ->(s : SampleValueCollection) { s.create }
       builder = Spectator::DSL::SampleExampleGroupBuilder.new("foobar", SampleValueCollection, create_proc, "value", symbol)
       count.times { builder.add_child(factory) }
diff --git a/src/spectator/formatting/human_time.cr b/src/spectator/formatting/human_time.cr
index 0eff947..c7ec687 100644
--- a/src/spectator/formatting/human_time.cr
+++ b/src/spectator/formatting/human_time.cr
@@ -25,15 +25,15 @@ module Spectator::Formatting
       return "#{seconds.round(2)} seconds" if seconds < 60
 
       int_seconds = seconds.to_i
-      minutes = int_seconds / 60
+      minutes = int_seconds // 60
       int_seconds %= 60
       return sprintf("%i:%02i", minutes, int_seconds) if minutes < 60
 
-      hours = minutes / 60
+      hours = minutes // 60
       minutes %= 60
       return sprintf("%i:%02i:%02i", hours, minutes, int_seconds) if hours < 24
 
-      days = hours / 24
+      days = hours // 24
       hours %= 24
       sprintf("%i days %i:%02i:%02i", days, hours, minutes, int_seconds)
     end