diff --git a/src/hardware/tandy_sound.cpp b/src/hardware/tandy_sound.cpp
index 5d3ef2ea..8153e7be 100644
--- a/src/hardware/tandy_sound.cpp
+++ b/src/hardware/tandy_sound.cpp
@@ -405,7 +405,7 @@ static void TandyDACWrite(Bitu port,Bitu data,Bitu /*iolen*/) {
 		}
 		break;
 	case 0xc6:
-		tandy.dac.frequency = tandy.dac.frequency & 0xf00 | (Bit8u)(data&0xff);
+		tandy.dac.frequency = (tandy.dac.frequency & 0xf00) | (Bit8u)(data & 0xff);
 		switch (tandy.dac.mode&3) {
 		case 0:
 			// joystick mode
@@ -418,7 +418,7 @@ static void TandyDACWrite(Bitu port,Bitu data,Bitu /*iolen*/) {
 		}
 		break;
 	case 0xc7:
-		tandy.dac.frequency = tandy.dac.frequency & 0x00ff | (((Bit8u)(data&0xf))<<8);
+		tandy.dac.frequency = (tandy.dac.frequency & 0x00ff) | (((Bit8u)(data & 0xf)) << 8);
 		tandy.dac.amplitude = (Bit8u)(data>>5);
 		switch (tandy.dac.mode&3) {
 		case 0: