diff --git a/engines/zvision/utility.h b/engines/zvision/utility.h
index e68d0de4491..9cc0d1e4e16 100644
--- a/engines/zvision/utility.h
+++ b/engines/zvision/utility.h
@@ -70,7 +70,7 @@ template<class T>
 void removeDuplicateEntries(Common::Array<T> *container) {
 	Common::sort(container->front(), container->back());
 
-	for (int i = 0; i < container->size(); i++) {
+	for (uint i = 0; i < container->size(); i++) {
 		while (container[i] == container[i +1]) {
 			container->remove_at(i + 1);
 		}