diff --git a/crates/mist-api/src/transpiler.mist b/crates/mist-api/src/transpiler.mist
index 7e2ff5b..ba66a5f 100644
--- a/crates/mist-api/src/transpiler.mist
+++ b/crates/mist-api/src/transpiler.mist
@@ -84,7 +84,7 @@ pub fn transpile() PathBuf {
 }
 
 impl modules::Module {
-    fn transpile(*self, parent_dir *PathBuf, config *mut MistConfig) String {
+    fn transpile(*self, parent_dir *PathBuf, config *mut MistConfig) [bool, String] {
         if !self.path.is_dir() && self.path.extension().and_then(fn(v) -> v.to_str()) != Some("mist") {
             let file_name = self.path.file_name()
                 .and_then(fn(s) -> s.to_str())
@@ -92,7 +92,7 @@ impl modules::Module {
 
             fs::copy(&self.path, parent_dir.join(&file_name)).expect("Failed to copy SideFile");
 
-            return String::new();
+            return (true, String::new());
         }
 
         let dir = self.output_dir(parent_dir);
@@ -101,9 +101,16 @@ impl modules::Module {
 
         let mut output = String::new();
 
+        let mut child_changed = false;
+
         for child in &self.children {
             if !config.should_ignore(&child.path) {
-                output.push_str(&child.transpile(&dir, config));
+                let out = child.transpile(&dir, config);
+                if out.0 {
+                    child_changed = true;
+                }
+
+                output.push_str(&out.1);
             }
         }
 
@@ -113,15 +120,15 @@ impl modules::Module {
             output.push_str(&config.main_mods)
         }
 
-        self.write_transpile(output, parent_dir)
+        self.write_transpile(output, parent_dir, child_changed)
     }
 
-    fn write_transpile(*self, output String, parent_dir *PathBuf) String {
+    fn write_transpile(*self, output String, parent_dir *PathBuf, child_changed bool) [bool, String] {
         if self.path.is_dir() {
             let output_file = self.output_path(parent_dir, &None);
 
             if output.len() == 0 {
-                return String::new();
+                return (true, String::new());
             }
 
             let res = fs::write(&output_file, output);
@@ -136,7 +143,7 @@ impl modules::Module {
                 process::exit(1);
             }
 
-            format!("pub mod {};\n", self.name)
+            (false, format!("pub mod {};\n", self.name))
         } else {
             let source = match fs::read_to_string(&self.path) {
                 Ok[s] => s;
@@ -151,15 +158,17 @@ impl modules::Module {
 
             let output_file = self.output_path(parent_dir, &curr_mod_decl);
 
-            if is_source_newer(&self.path, &output_file).expect("Failed to cache") {
+            let should_change = is_source_newer(&self.path, &output_file).expect("Failed to cache");
+
+            if should_change || child_changed {
                 transpile_file(&self.path, &source, output_file, &output, &curr_mod_decl);
             }
 
-            if let Some[[vis, name]] = &curr_mod_decl {
+            (should_change, if let Some[[vis, name]] = &curr_mod_decl {
                 format!("{}mod {};\n", vis.get_rust(), name.get_rust())
             } else {
                 String::new()
-            }
+            })
         }
     }
 }