diff --git a/lib/simplecov/file_list.rb b/lib/simplecov/file_list.rb
index 549070ba..21b3d75c 100644
--- a/lib/simplecov/file_list.rb
+++ b/lib/simplecov/file_list.rb
@@ -39,6 +39,6 @@ def covered_percent
   # Computes the strength (hits / line) based upon lines covered and lines missed
   def covered_strength
     return 0 if empty? or lines_of_code == 0
-    map {|f| f.covered_strength }.inject(&:+) / size
+    map {|f| f.covered_strength }.inject(&:+).to_f / size
   end
 end
diff --git a/lib/simplecov/source_file.rb b/lib/simplecov/source_file.rb
index deb1998d..73d90cc7 100644
--- a/lib/simplecov/source_file.rb
+++ b/lib/simplecov/source_file.rb
@@ -114,7 +114,7 @@ def covered_percent
       if relevant_lines == 0
         0
       else
-        (covered_lines.count) * 100 / relevant_lines.to_f
+        (covered_lines.count) * 100.0 / relevant_lines.to_f
       end
     end