diff --git a/cpu.cpp b/cpu.cpp
index a478fbe..18303cf 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -901,7 +901,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
 				 if (word_mode) {  // MFPS
 					 uint16_t temp = psw & 0xff;
 
-					 if (dst_mode == 0 && sign(temp))
+					 if (dst_mode == 0 && SIGN(temp))
 						 temp |= 0xff00;
 
 					 putGAM(dst_mode, dst_reg, word_mode, temp, false);