diff --git a/src/app/tests.rs b/src/app/tests.rs
index 74bd169..073542c 100644
--- a/src/app/tests.rs
+++ b/src/app/tests.rs
@@ -50,7 +50,7 @@ fn applies_configuration() -> anyhow::Result<()> {
             path: folder_directory.path().to_owned(),
             name: Some("notes".to_owned()),
             folder_id: None,
-            capability_env: None,
+            capability_environment_variable: None,
             mode: crate::domain::FolderMode::ReceiveOnly,
         }],
     };
diff --git a/src/config.rs b/src/config.rs
index 1af5bd8..5708af9 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -29,7 +29,8 @@ pub struct ConfiguredFolder {
     pub(crate) path: PathBuf,
     pub(crate) name: Option<String>,
     pub(crate) folder_id: Option<Uuid>,
-    pub(crate) capability_env: Option<String>,
+    #[serde(rename = "capability_env")]
+    pub(crate) capability_environment_variable: Option<String>,
     #[serde(default)]
     pub(crate) mode: FolderMode,
 }
@@ -61,7 +62,7 @@ impl AppaConfig {
 
     pub fn capability(&self, folder: &ConfiguredFolder) -> anyhow::Result<Option<String>> {
         folder
-            .capability_env
+            .capability_environment_variable
             .as_ref()
             .map(|variable| match env::var(variable) {
                 Ok(value) => Ok(value),
@@ -78,7 +79,7 @@ impl AppaConfig {
             anyhow::bail!("unsupported Appa config version {}", self.version);
         }
         for folder in &self.folders {
-            if folder.folder_id.is_some() != folder.capability_env.is_some() {
+            if folder.folder_id.is_some() != folder.capability_environment_variable.is_some() {
                 anyhow::bail!(
                     "{} must set both folder_id and capability_env to create a joined folder",
                     folder.path.display()
@@ -95,7 +96,7 @@ impl ConfiguredFolder {
             path: folder.path.clone(),
             name: Some(folder.name.clone()),
             folder_id: None,
-            capability_env: None,
+            capability_environment_variable: None,
             mode: folder.mode,
         }
     }