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-rw-r--r--engines/lab/processroom.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/engines/lab/processroom.cpp b/engines/lab/processroom.cpp
index 0d60724e27..ad8db8499f 100644
--- a/engines/lab/processroom.cpp
+++ b/engines/lab/processroom.cpp
@@ -443,7 +443,7 @@ void LabEngine::doActions(Action *actionList, CloseDataPtr *closePtrList) {
_anim->_doBlack = (_closeDataPtr != nullptr);
else if (actionList->_param1 == 5) {
// inverse the palette
- for (uint16 idx = (8 * 3); idx < (255 * 3); idx++)
+ for (int idx = (8 * 3); idx < (255 * 3); idx++)
_anim->_diffPalette[idx] = 255 - _anim->_diffPalette[idx];
waitTOF();