diff --git a/src/emu.rs b/src/emu.rs
index 362ba01..2845665 100644
--- a/src/emu.rs
+++ b/src/emu.rs
@@ -141,9 +141,12 @@ impl GameBoy {
             Err(e) => panic!("{e}"),
         };
 
-        let mut bios = fs::File::open("DMG_ROM.bin").expect("could not open bios");
-        bios.read_exact(&mut self.boot_rom)
-            .expect("fail to read rom");
+        let bios_filename = "DMG_ROM.bin";
+        if let Ok(mut bios) = fs::File::open(bios_filename) {
+            bios.read_exact(&mut self.boot_rom).expect("fail to read rom {bios_filename}");
+        } else {
+            println!("could not find bios file; continuing without");
+        }
     }
 
     pub fn register_breakpoint(&mut self, adr: &str) {