diff --git a/desmume/src/thumb_instructions.cpp b/desmume/src/thumb_instructions.cpp
index 8ee622b00..7102cc79c 100644
--- a/desmume/src/thumb_instructions.cpp
+++ b/desmume/src/thumb_instructions.cpp
@@ -455,7 +455,7 @@ TEMPLATE static  u32 FASTCALL OP_ADC_REG(const u32 i)
 	}
 	cpu->CPSR.bits.N = BIT31(cpu->R[REG_NUM(i, 0)]);
 	cpu->CPSR.bits.Z = (cpu->R[REG_NUM(i, 0)] == 0);
-	cpu->CPSR.bits.V = (Rd ^ Rm ^ -1) & (Rd ^ cpu->R[REG_NUM(i, 0)]) != 0;
+	cpu->CPSR.bits.V = (((Rd ^ Rm ^ -1) & (Rd ^ cpu->R[REG_NUM(i, 0)])) != 0);
 	
 	return 1;
 }