diff --git a/SheepShaver/src/video.cpp b/SheepShaver/src/video.cpp
index d0eda93d..60ef8c13 100644
--- a/SheepShaver/src/video.cpp
+++ b/SheepShaver/src/video.cpp
@@ -736,7 +736,7 @@ static int16 VideoStatus(uint32 pb, VidLocals *csSave)
 
 		case cscGetNextResolution: {
 			D(bug("GetNextResolution \n"));
-			int work_id = ReadMacInt32(param + csPreviousDisplayModeID);
+			unsigned int work_id = ReadMacInt32(param + csPreviousDisplayModeID);
 			switch (work_id) {
 				case kDisplayModeIDCurrent:
 					work_id = csSave->saveData;