diff --git a/src/engine/platform/sound/ymfm/ymfm_opm.h b/src/engine/platform/sound/ymfm/ymfm_opm.h
index 2034b5f4..830b195e 100644
--- a/src/engine/platform/sound/ymfm/ymfm_opm.h
+++ b/src/engine/platform/sound/ymfm/ymfm_opm.h
@@ -174,7 +174,7 @@ public:
 	// system-wide registers
 	uint32_t test() const                            { return byte(0x01, 0, 8); }
 	uint32_t lfo_reset() const                       { return byte(0x01, 1, 1); }
-	uint32_t noise_frequency() const                 { return byte(0x0f, 0, 5) ^ 0x1f; }
+	uint32_t noise_frequency() const                 { return byte(0x0f, 0, 5); }
 	uint32_t noise_enable() const                    { return byte(0x0f, 7, 1); }
 	uint32_t timer_a_value() const                   { return word(0x10, 0, 8, 0x11, 0, 2); }
 	uint32_t timer_b_value() const                   { return byte(0x12, 0, 8); }