diff --git a/runtime/Cpp/runtime/src/atn/ParserATNSimulator.cpp b/runtime/Cpp/runtime/src/atn/ParserATNSimulator.cpp
index 3a1537587c..2817c30323 100755
--- a/runtime/Cpp/runtime/src/atn/ParserATNSimulator.cpp
+++ b/runtime/Cpp/runtime/src/atn/ParserATNSimulator.cpp
@@ -1201,8 +1201,7 @@ Ref<ATNConfig> ParserATNSimulator::ruleTransition(Ref<ATNConfig> const& config,
 }
 
 BitSet ParserATNSimulator::getConflictingAlts(ATNConfigSet *configs) {
-  std::vector<BitSet> altsets = PredictionModeClass::getConflictingAltSubsets(configs);
-  return PredictionModeClass::getAlts(altsets);
+  return PredictionModeClass::getAlts(configs);
 }
 
 BitSet ParserATNSimulator::getConflictingAltsOrUniqueAlt(ATNConfigSet *configs) {