diff --git a/cloudinit/cloud_config.go b/cloudinit/cloud_config.go
index 712eddc..aa30aa9 100644
--- a/cloudinit/cloud_config.go
+++ b/cloudinit/cloud_config.go
@@ -16,8 +16,8 @@ type CloudConfig struct {
 		Fleet struct{ Autostart bool }
 		Units []Unit
 	}
-	Write_Files []WriteFile
-	Hostname    string
+	WriteFiles []WriteFile `yaml:"write_files"`
+	Hostname   string
 }
 
 func NewCloudConfig(contents []byte) (*CloudConfig, error) {
@@ -55,8 +55,8 @@ func ApplyCloudConfig(cfg CloudConfig, sshKeyName string) error {
 		}
 	}
 
-	if len(cfg.Write_Files) > 0 {
-		for _, file := range cfg.Write_Files {
+	if len(cfg.WriteFiles) > 0 {
+		for _, file := range cfg.WriteFiles {
 			if err := ProcessWriteFile("/", &file); err != nil {
 				return err
 			}
diff --git a/cloudinit/cloud_config_test.go b/cloudinit/cloud_config_test.go
index 1fe9a4f..66b8af3 100644
--- a/cloudinit/cloud_config_test.go
+++ b/cloudinit/cloud_config_test.go
@@ -25,8 +25,8 @@ func TestCloudConfigEmpty(t *testing.T) {
 		t.Error("Expected AutostartFleet not to be defined")
 	}
 
-	if len(cfg.Write_Files) != 0 {
-		t.Error("Expected zero Write_Files")
+	if len(cfg.WriteFiles) != 0 {
+		t.Error("Expected zero WriteFiles")
 	}
 
 	if cfg.Hostname != "" {
@@ -89,10 +89,10 @@ hostname: trontastic
 		t.Error("Expected AutostartFleet to be true")
 	}
 
-	if len(cfg.Write_Files) != 1 {
+	if len(cfg.WriteFiles) != 1 {
 		t.Error("Failed to parse correct number of write_files")
 	} else {
-		wf := cfg.Write_Files[0]
+		wf := cfg.WriteFiles[0]
 		if wf.Content != "penny\nelroy\n" {
 			t.Errorf("WriteFile has incorrect contents '%s'", wf.Content)
 		}