diff --git a/lib/github_workflows_generator/yml_encoder.ex b/lib/github_workflows_generator/yml_encoder.ex
index 7a19d93..df0b563 100644
--- a/lib/github_workflows_generator/yml_encoder.ex
+++ b/lib/github_workflows_generator/yml_encoder.ex
@@ -32,7 +32,7 @@ defmodule GithubWorkflowsGenerator.YmlEncoder do
         values =
           data
           |> String.split("\n", trim: true)
-          |> Enum.map_join("\n", &(String.duplicate("  ", level) <> value(&1)))
+          |> Enum.map_join("\n", &(String.duplicate("  ", level) <> &1))
 
         "|\n#{values}"
 
diff --git a/test/github_workflows_generator/yml_encoder_test.exs b/test/github_workflows_generator/yml_encoder_test.exs
index 71f1db9..eea3fec 100644
--- a/test/github_workflows_generator/yml_encoder_test.exs
+++ b/test/github_workflows_generator/yml_encoder_test.exs
@@ -29,6 +29,14 @@ defmodule GithubWorkflowsGenerator.YmlEncoderTest do
              """
     end
 
+    test "encodes a multiline string with colons correctly" do
+      assert YmlEncoder.encode(example: "this: is valid\nanother: line") == """
+             example: |
+               this: is valid
+               another: line
+             """
+    end
+
     test "encodes a complex data structure" do
       assert YmlEncoder.encode(
                on: [