diff --git a/src/classify/cluster.cpp b/src/classify/cluster.cpp
index fd889780..4143bbbb 100644
--- a/src/classify/cluster.cpp
+++ b/src/classify/cluster.cpp
@@ -3238,10 +3238,10 @@ static bool MultipleCharSamples(CLUSTERER *Clusterer, CLUSTER *Cluster, float Ma
   InitSampleSearch(SearchState, Cluster);
   while ((Sample = NextSample(&SearchState)) != nullptr) {
     CharID = Sample->CharID;
-    if (CharFlags[CharID] == false) {
+    if (CharFlags[CharID] == 0) {
       CharFlags[CharID] = true;
     } else {
-      if (CharFlags[CharID] == true) {
+      if (CharFlags[CharID] == 1) {
         NumIllegalInCluster++;
         CharFlags[CharID] = ILLEGAL_CHAR;
       }