diff --git a/src/instructions/rjmp.rs b/src/instructions/rjmp.rs
index 71b5f90..c3922d2 100644
--- a/src/instructions/rjmp.rs
+++ b/src/instructions/rjmp.rs
@@ -1,8 +1,9 @@
-use crate::stack::StackVec;
+use crate::{errors::RunError, stack::StackVec};
 
 pub fn rjmp(memory: &mut StackVec, labels: &mut [Option<i16>; 256], program_counter: &mut u16) {
     let start = memory.pop() as usize;
     let end   = memory.pop() as usize;
+    let rand  = fastrand::usize(start..end + 1);
 
-    *program_counter = (labels[fastrand::usize(start..end)].unwrap() - 1) as u16;
+    *program_counter = (labels[rand].expect(&format!("{}", RunError::UnknownLabel(rand as u16))) - 1) as u16;
 }
\ No newline at end of file