diff --git a/build.rs b/build.rs
index d8db299..93d4fb2 100644
--- a/build.rs
+++ b/build.rs
@@ -9,4 +9,8 @@ fn main() {
             .compile("libc_code.a");
         println!("cargo:rerun-if-changed=src/log.c");
     }
+
+    if !std::fs::exists("webui/index.html").unwrap_or(false) {
+        panic!("Could not compile crate! Missing webui! Did you pull submodules?");
+    }
 }