diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3497cc86..ceec7870 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 0.12.1 (2018-02-26)
+
+### Bugfixes (User Facing)
+* Formatters that use `FileCreation.each` will no longer silently fail on file
+creation and now also sanitizes `/` and other file name characters to be `_`.
+Thanks @gfvcastro
+
 ## 0.12.0 (2018-01-20)
 
 Adds the ability to save benchmarking results and load them again to compare
diff --git a/lib/benchee/utility/file_creation.ex b/lib/benchee/utility/file_creation.ex
index 3b743af3..006882f3 100644
--- a/lib/benchee/utility/file_creation.ex
+++ b/lib/benchee/utility/file_creation.ex
@@ -35,7 +35,7 @@ defmodule Benchee.Utility.FileCreation do
     ensure_directory_exists filename
     Enum.each names_to_content, fn({input_name, content}) ->
       input_filename = interleave(filename, input_name)
-      File.open input_filename, [:write, :utf8], fn(file) ->
+      File.open! input_filename, [:write, :utf8], fn(file) ->
         function.(file, content, input_filename)
       end
     end
@@ -68,6 +68,9 @@ defmodule Benchee.Utility.FileCreation do
       iex> Benchee.Utility.FileCreation.interleave("abc.csv", "Big Input")
       "abc_big_input.csv"
 
+      iex> Benchee.Utility.FileCreation.interleave("abc.csv", "String.length/1")
+      "abc_string_length_1.csv"
+
       iex> Benchee.Utility.FileCreation.interleave("bench/abc.csv", "Big Input")
       "bench/abc_big_input.csv"
 
@@ -123,7 +126,7 @@ defmodule Benchee.Utility.FileCreation do
     case name_string do
       ^no_input -> ""
       _         ->
-        String.downcase(String.replace(name_string, " ", "_"))
+        String.downcase(String.replace(name_string, ~r/[^0-9A-Z]/i, "_"))
     end
   end
 end
diff --git a/mix.exs b/mix.exs
index 5394e333..ccf1b128 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule Benchee.Mixfile do
   use Mix.Project
 
-  @version "0.12.0"
+  @version "0.12.1"
 
   def project do
     [
diff --git a/test/benchee/utility/file_creation_integration_test.exs b/test/benchee/utility/file_creation_integration_test.exs
index 34cc98d4..dc34d7e5 100644
--- a/test/benchee/utility/file_creation_integration_test.exs
+++ b/test/benchee/utility/file_creation_integration_test.exs
@@ -24,7 +24,7 @@ defmodule Benchee.Utility.FileCreationIntegrationTest do
       end
     end
 
-    test "by default writes writes files" do
+    test "by default writes files" do
       try do
         capture_io fn -> each @input_to_contents, @filename end
         assert_correct_files()
@@ -44,6 +44,16 @@ defmodule Benchee.Utility.FileCreationIntegrationTest do
       end
     end
 
+    test "with String.length/1 as a name it writes the correct file" do
+      to_contents = %{
+        "String.length/1" => "abc"
+      }
+      capture_io fn -> each to_contents, @filename end
+      assert File.exists? "#{@directory}/test_string_length_1.txt"
+    after
+      File.rm_rf! @directory
+    end
+
     defp assert_correct_files do
       assert File.exists? @file_name_1
       assert File.exists? @file_name_2