diff --git a/src/engine/platform/sound/ymfm/ymfm_opn.h b/src/engine/platform/sound/ymfm/ymfm_opn.h
index 34dc065d7..00fd61adf 100644
--- a/src/engine/platform/sound/ymfm/ymfm_opn.h
+++ b/src/engine/platform/sound/ymfm/ymfm_opn.h
@@ -784,7 +784,7 @@ public:
 
 protected:
 	// simulate the DAC discontinuity
-	constexpr int32_t dac_discontinuity(int32_t value) const { return (value < 0) ? (value - 2) : (value + 3); }
+	int32_t dac_discontinuity(int32_t value) const { return (value < 0) ? (value - 2) : (value + 3); }
 
 	// internal state
 	uint16_t m_address;              // address register