diff --git a/BasiliskII/src/Unix/serial_unix.cpp b/BasiliskII/src/Unix/serial_unix.cpp
index 81922b43..0f28ec7c 100644
--- a/BasiliskII/src/Unix/serial_unix.cpp
+++ b/BasiliskII/src/Unix/serial_unix.cpp
@@ -648,16 +648,16 @@ bool XSERDPort::configure(uint16 config)
 	// Set number of data bits
 	switch (config & 0x0c00) {
 		case data5:
-			mode.c_cflag = mode.c_cflag & ~CSIZE | CS5;
+			mode.c_cflag = (mode.c_cflag & ~CSIZE) | CS5;
 			break;
 		case data6:
-			mode.c_cflag = mode.c_cflag & ~CSIZE | CS6;
+			mode.c_cflag = (mode.c_cflag & ~CSIZE) | CS6;
 			break;
 		case data7:
-			mode.c_cflag = mode.c_cflag & ~CSIZE | CS7;
+			mode.c_cflag = (mode.c_cflag & ~CSIZE) | CS7;
 			break;
 		case data8:
-			mode.c_cflag = mode.c_cflag & ~CSIZE | CS8;
+			mode.c_cflag = (mode.c_cflag & ~CSIZE) | CS8;
 			break;
 	}
 
diff --git a/BasiliskII/src/sony.cpp b/BasiliskII/src/sony.cpp
index 804239b7..46289007 100644
--- a/BasiliskII/src/sony.cpp
+++ b/BasiliskII/src/sony.cpp
@@ -263,7 +263,7 @@ int16 SonyOpen(uint32 pb, uint32 dce)
 
 	// Set up DCE
 	WriteMacInt32(dce + dCtlPosition, 0);
-	WriteMacInt16(dce + dCtlQHdr + qFlags, ReadMacInt16(dce + dCtlQHdr + qFlags) & 0xff00 | 3);	// Version number, must be >=3 or System 8 will replace us
+	WriteMacInt16(dce + dCtlQHdr + qFlags, (ReadMacInt16(dce + dCtlQHdr + qFlags) & 0xff00) | 3);	// Version number, must be >=3 or System 8 will replace us
 	acc_run_called = false;
 
 	// Install driver again with refnum -2 (HD20)
@@ -520,7 +520,7 @@ int16 SonyStatus(uint32 pb, uint32 dce)
 			break;
 
 		case 10:		// Get disk type and MFM info
-			WriteMacInt32(pb + csParam, ReadMacInt32(info->status + dsMFMDrive) & 0xffffff00 | 0xfe);	// 0xfe = SWIM2 controller
+			WriteMacInt32(pb + csParam, (ReadMacInt32(info->status + dsMFMDrive) & 0xffffff00) | 0xfe);	// 0xfe = SWIM2 controller
 			break;
 
 //		case 0x4350:	// Measure disk speed at a given track ('CP') (not supported)
diff --git a/SheepShaver/src/MacOSX/prefs_macosx.mm b/SheepShaver/src/MacOSX/prefs_macosx.mm
index 4f91cdbb..63be01af 100644
--- a/SheepShaver/src/MacOSX/prefs_macosx.mm
+++ b/SheepShaver/src/MacOSX/prefs_macosx.mm
@@ -52,7 +52,7 @@
 		return nil;
 	}
 
-	NSLog(@"%d objects loaded\n", [objects count]);
+	NSLog(@"%lu objects loaded\n", [objects count]);
 
 	// Release the raw nib data.
 	[nib release];
diff --git a/SheepShaver/src/timer.cpp b/SheepShaver/src/timer.cpp
index f8a52ecc..ca733340 100644
--- a/SheepShaver/src/timer.cpp
+++ b/SheepShaver/src/timer.cpp
@@ -337,7 +337,7 @@ void TimerReset(void)
 int16 InsTime(uint32 tm, uint16 trap)
 {
 	D(bug("InsTime %08lx, trap %04x\n", tm, trap));
-	WriteMacInt16((uint32)tm + qType, ReadMacInt16((uint32)tm + qType) & 0x1fff | (trap << 4) & 0x6000);
+	WriteMacInt16((uint32)tm + qType, (ReadMacInt16((uint32)tm + qType) & 0x1fff) | ((trap << 4) & 0x6000));
 	if (find_desc(tm))
 		printf("WARNING: InsTime(%08x): Task re-inserted\n", tm);
 	else {