diff --git a/Cargo.lock b/Cargo.lock
index 4372916f..bdcc14cc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1628,7 +1628,7 @@ dependencies = [
 
 [[package]]
 name = "starship_module_config_derive"
-version = "0.1.3"
+version = "0.2.0"
 dependencies = [
  "proc-macro2",
  "quote 1.0.9",
diff --git a/Cargo.toml b/Cargo.toml
index 9c7939b7..9589c082 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -48,7 +48,7 @@ once_cell = "1.7.2"
 chrono = "0.4.19"
 sys-info = "0.8.0"
 byte-unit = "4.0.10"
-starship_module_config_derive = { version = "0.1.2", path = "starship_module_config_derive" }
+starship_module_config_derive = { version = "0.2.0", path = "starship_module_config_derive" }
 yaml-rust = "0.4.5"
 pest = "2.1.3"
 pest_derive = "2.1.0"
diff --git a/src/config.rs b/src/config.rs
index 0e6a35df..2a5163b6 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -20,10 +20,9 @@ where
     /// Load root module config from given Value and fill unset variables with default
     /// values.
     fn load(config: &'a Value) -> Self {
-        if config.get("prompt_order").is_some() {
-            log::warn!("\"prompt_order\" has been removed in favor of \"format\". For more details, see: https://starship.rs/migrating-to-0.45.0/")
-        }
-        Self::default().load_config(config)
+        let mut out = Self::default();
+        out.load_config(config);
+        out
     }
 
     /// Helper function that will call RootModuleConfig::load(config) if config is Some,
@@ -50,8 +49,10 @@ where
     }
 
     /// Merge `self` with config from a toml table.
-    fn load_config(&self, config: &'a Value) -> Self {
-        Self::from_config(config).unwrap_or_else(|| self.clone())
+    fn load_config(&mut self, config: &'a Value) {
+        if let Some(value) = Self::from_config(config) {
+            let _ = std::mem::replace(self, value);
+        }
     }
 }
 
@@ -492,12 +493,12 @@ mod tests {
             disabled = true
             some_array = ["A"]
         };
-        let default_config = TestConfig {
+        let mut rust_config = TestConfig {
             symbol: "S ",
             disabled: false,
             some_array: vec!["A", "B", "C"],
         };
-        let rust_config = default_config.load_config(&config);
+        rust_config.load_config(&config);
 
         assert_eq!(rust_config.symbol, "T ");
         assert_eq!(rust_config.disabled, true);
@@ -523,7 +524,7 @@ mod tests {
             modified = { value = "•", style = "red" }
         };
 
-        let default_config = TestConfig {
+        let mut git_status_config = TestConfig {
             untracked: SegmentDisplayConfig {
                 value: "?",
                 style: Color::Red.bold(),
@@ -533,7 +534,7 @@ mod tests {
                 style: Color::Red.bold(),
             },
         };
-        let git_status_config = default_config.load_config(&config);
+        git_status_config.load_config(&config);
 
         assert_eq!(
             git_status_config.untracked,
@@ -562,11 +563,11 @@ mod tests {
         let config = toml::toml! {
             optional = "test"
         };
-        let default_config = TestConfig {
+        let mut rust_config = TestConfig {
             optional: None,
             hidden: None,
         };
-        let rust_config = default_config.load_config(&config);
+        rust_config.load_config(&config);
 
         assert_eq!(rust_config.optional, Some("test"));
         assert_eq!(rust_config.hidden, None);
@@ -607,12 +608,12 @@ mod tests {
             switch_a = "on"
             switch_b = "any"
         };
-        let default_config = TestConfig {
+        let mut rust_config = TestConfig {
             switch_a: Switch::Off,
             switch_b: Switch::Off,
             switch_c: Switch::Off,
         };
-        let rust_config = default_config.load_config(&config);
+        rust_config.load_config(&config);
 
         assert_eq!(rust_config.switch_a, Switch::On);
         assert_eq!(rust_config.switch_b, Switch::Off);
diff --git a/src/configs/starship_root.rs b/src/configs/starship_root.rs
index 4d26fd1c..cefa8507 100644
--- a/src/configs/starship_root.rs
+++ b/src/configs/starship_root.rs
@@ -1,9 +1,8 @@
-use crate::config::ModuleConfig;
+use crate::{config::ModuleConfig, module::ALL_MODULES};
 
 use serde::Serialize;
-use starship_module_config_derive::ModuleConfig;
 
-#[derive(Clone, ModuleConfig, Serialize)]
+#[derive(Clone, Serialize)]
 pub struct StarshipRootConfig<'a> {
     pub format: &'a str,
     pub scan_timeout: u64,
@@ -88,3 +87,27 @@ impl<'a> Default for StarshipRootConfig<'a> {
         }
     }
 }
+
+impl<'a> ModuleConfig<'a> for StarshipRootConfig<'a> {
+    fn load_config(&mut self, config: &'a toml::Value) {
+        if let toml::Value::Table(config) = config {
+            config.iter().for_each(|(k, v)| match k.as_str() {
+                "format" => self.format.load_config(v),
+                "scan_timeout" => self.scan_timeout.load_config(v),
+                "command_timeout" => self.command_timeout.load_config(v),
+                "add_newline" => self.add_newline.load_config(v),
+                unknown => {
+                    if !ALL_MODULES.contains(&unknown) && unknown != "custom" {
+                        log::warn!("Unknown config key '{}'", unknown);
+                    }
+                }
+            });
+        }
+    }
+
+    fn from_config(config: &'a toml::Value) -> Option<Self> {
+        let mut out = Self::default();
+        out.load_config(config);
+        Some(out)
+    }
+}
diff --git a/starship_module_config_derive/Cargo.toml b/starship_module_config_derive/Cargo.toml
index 04352616..642d424e 100644
--- a/starship_module_config_derive/Cargo.toml
+++ b/starship_module_config_derive/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "starship_module_config_derive"
-version = "0.1.3"
+version = "0.2.0"
 edition = "2018"
 authors = ["Matan Kushner <hello@matchai.me>"]
 homepage = "https://starship.rs"
diff --git a/starship_module_config_derive/src/lib.rs b/starship_module_config_derive/src/lib.rs
index 8594a902..254b0a3c 100644
--- a/starship_module_config_derive/src/lib.rs
+++ b/starship_module_config_derive/src/lib.rs
@@ -23,9 +23,7 @@ fn impl_module_config(dinput: DeriveInput) -> proc_macro::TokenStream {
                 let ident = field.ident.as_ref().unwrap();
 
                 let new_load_tokens = quote! {
-                    if let Some(config_str) = config.get(stringify!(#ident)) {
-                        new_module_config.#ident = new_module_config.#ident.load_config(config_str);
-                    }
+                    stringify!(#ident) => self.#ident.load_config(v),
                 };
 
                 load_tokens = quote! {
@@ -35,23 +33,24 @@ fn impl_module_config(dinput: DeriveInput) -> proc_macro::TokenStream {
             }
 
             load_config = quote! {
-                fn load_config(&self, config: &'a toml::Value) -> Self {
-                    let mut new_module_config = self.clone();
+                fn load_config(&mut self, config: &'a toml::Value) {
                     if let toml::Value::Table(config) = config {
-                        if config.get("prefix").is_some() {
-                            log::warn!("\"prefix\" has been removed in favor of \"format\". For more details, see: https://starship.rs/migrating-to-0.45.0/")
-                        }
-                        if config.get("suffix").is_some() {
-                            log::warn!("\"suffix\" has been removed in favor of \"format\". For more details, see: https://starship.rs/migrating-to-0.45.0/")
-                        }
-                        #load_tokens
+                        config.iter().for_each(|(k, v)| {
+                            match k.as_str() {
+                                #load_tokens
+                                unknown => {
+                                    ::log::warn!("Unknown config key '{}'", unknown);
+                                },
+                            }
+                        });
                     }
-                    new_module_config
                 }
             };
             from_config = quote! {
                 fn from_config(config: &'a toml::Value) -> Option<Self> {
-                    Some(Self::default().load_config(config))
+                    let mut out = Self::default();
+                    out.load_config(config);
+                    Some(out)
                 }
             };
         }