diff --git a/arch/m68k/include/asm/cmpxchg.h b/arch/m68k/include/asm/cmpxchg.h
index 6cf464cdab06..694a44a5c3b0 100644
--- a/arch/m68k/include/asm/cmpxchg.h
+++ b/arch/m68k/include/asm/cmpxchg.h
@@ -32,7 +32,7 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
 		x = tmp;
 		break;
 	default:
-		tmp = __invalid_xchg_size(x, ptr, size);
+		x = __invalid_xchg_size(x, ptr, size);
 		break;
 	}