diff --git a/src/inst.rs b/src/inst.rs
index e8bfa1012ddc4fcd69428769051fdd76b4451396..eff4bf48c860c5e414acac65b72ad046ced4c017 100644
--- a/src/inst.rs
+++ b/src/inst.rs
@@ -232,7 +232,7 @@ pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
     (sub_a_u8, 8, "SUB A, u8"),
     (noimpl, 4, "! UNIMP !"),
     (noimpl, 4, "! UNIMP !"),
-    (noimpl, 4, "! UNIMP !"),
+    (reti, 16, "RETI"),
     (jp_c_u16, 12, "JP C, u16"),
     (noimpl, 4, "! UNIMP !"),
     (call_c_u16, 12, "CALL C, u16"),
@@ -1212,6 +1212,11 @@ fn sub_a_u8(cpu: &mut Cpu) {
     cpu.a = sub_set_flags(cpu, cpu.a, byte);
 }
 
+fn reti(cpu: &mut Cpu) {
+    cpu.pc = cpu.pop_word();
+    cpu.enable_int();
+}
+
 fn jp_c_u16(cpu: &mut Cpu) {
     let word = cpu.read_u16();