diff --git a/src/lib.rs b/src/lib.rs
index d4375b90..b66d85f1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -58,4 +58,8 @@ extern fn eh_personality() {}
 
 #[cfg(not(test))]
 #[lang = "panic_fmt"]
-extern fn panic_fmt() -> ! {loop{}}
+extern fn panic_fmt(fmt: core::fmt::Arguments, file: &str, line: u32) -> ! {
+    println!("\n\nPANIC in {} at line {}:", file, line);
+    println!("{}", fmt);
+    loop{}
+}