diff --git a/src/m68k.rs b/src/m68k.rs
index dfaa9e5..64e276f 100644
--- a/src/m68k.rs
+++ b/src/m68k.rs
@@ -747,6 +747,11 @@ impl M68K {
                     } else if last_cycle.is_err() {
                         self.stored_mem_cycles.pop();
                     }
+                } if format == 0 {
+                     // Nothing extra needed
+                } else {
+                    self.trap(14)?;
+                    return Err(InsExecError::AbnormalTrap);
                 }
                 self.sr = orig_sr;
             }