diff --git a/src/bin/bat/config.rs b/src/bin/bat/config.rs
index 9e38dfa4..6fa18f09 100644
--- a/src/bin/bat/config.rs
+++ b/src/bin/bat/config.rs
@@ -146,8 +146,11 @@ pub fn get_args_from_env_vars() -> Vec<OsString> {
         ("--style", "BAT_STYLE"),
     ]
     .iter()
-    .filter_map(|(flag, key)| env::var(key).ok().map(|var| [flag.to_string(), var]))
-    .flatten()
+    .filter_map(|(flag, key)| {
+        env::var(key)
+            .ok()
+            .map(|var| [flag.to_string(), var].join("="))
+    })
     .map(|a| a.into())
     .collect()
 }