diff --git a/commands_test.go b/commands_test.go
index 18a2d24..465322c 100644
--- a/commands_test.go
+++ b/commands_test.go
@@ -1,6 +1,8 @@
 package main
 
 import (
+	"os"
+	"path/filepath"
 	"testing"
 )
 
@@ -24,3 +26,13 @@ func TestStrPadRight(t *testing.T) {
 		}
 	}
 }
+
+func TestLoadHostfile(t *testing.T) {
+	// Issue #39: This hosts file contains a duplicate. We should paper over it.
+	os.Setenv("HOSTESS_PATH", filepath.Join("testdata", "issue39"))
+	defer os.Unsetenv("HOSTESS_PATH")
+
+	if _, err := LoadHostfile(); err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/testdata/issue39 b/testdata/issue39
new file mode 100644
index 0000000..1bb4b04
--- /dev/null
+++ b/testdata/issue39
@@ -0,0 +1,6 @@
+127.0.0.1 localhost kubernetes.docker.internal
+::1 localhost
+# Added by Docker Desktop
+# To allow the same kube context to work on the host and the container:
+127.0.0.1 kubernetes.docker.internal
+# End of section