diff --git a/runtime/Go/src/antlr4/ATNConfigSet.go b/runtime/Go/src/antlr4/ATNConfigSet.go
index 98433b1cf..48f482a32 100644
--- a/runtime/Go/src/antlr4/ATNConfigSet.go
+++ b/runtime/Go/src/antlr4/ATNConfigSet.go
@@ -253,8 +253,11 @@ func (this *ATNConfigSet) setReadonly(readOnly bool) {
 func (this *ATNConfigSet) toString() string {
 	s := ""
 
-	for _,c := range this.configs {
+	for i,c := range this.configs {
 		s += c.toString()
+		if (i != len(this.configs)-1){
+			s += ","
+		}
 	}
 
 	if (this.hasSemanticContext){
diff --git a/runtime/Go/src/antlr4/DFA.go b/runtime/Go/src/antlr4/DFA.go
index 74feeadf0..ede0e56b0 100644
--- a/runtime/Go/src/antlr4/DFA.go
+++ b/runtime/Go/src/antlr4/DFA.go
@@ -1,4 +1,5 @@
 package antlr4
+import "sort"
 
 type DFA struct {
 	atnStartState IDecisionState
@@ -107,21 +108,25 @@ func (this *DFA) GetStates() map[string]*DFAState {
 	return this._states
 }
 
+type DFAStateList []*DFAState
+
+func (a DFAStateList) Len() int           { return len(a) }
+func (a DFAStateList) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a DFAStateList) Less(i, j int) bool { return a[i].stateNumber < a[j].stateNumber }
+
 // Return a list of all states in this DFA, ordered by state number.
 func (this *DFA) sortedStates() []*DFAState {
 
-	panic("Not implemented")
+	// extract the values
+	vs := make([]*DFAState, len(this._states))
+	i := 0
+	for _,v := range this._states {
+		vs[i] = v
+		i++
+	}
 
-	return nil
-	// states_ is a map of state/state, where key=value
-	//	var keys = Object.keys(this._states)
-	//	var list = []
-	//	for i:=0; i<keys.length; i++ {
-	//		list.push(this._states[keys[i]])
-	//	}
-	//	return list.sort(function(a, b) {
-	//		return a.stateNumber - b.stateNumber
-	//	})
+	sort.Sort(DFAStateList(vs))
+	return vs
 }
 
 func (this *DFA) toString(literalNames []string, symbolicNames []string) string {
diff --git a/runtime/Go/src/antlr4/PredictionMode.go b/runtime/Go/src/antlr4/PredictionMode.go
index 38ea321cc..07f5bd803 100644
--- a/runtime/Go/src/antlr4/PredictionMode.go
+++ b/runtime/Go/src/antlr4/PredictionMode.go
@@ -497,7 +497,7 @@ func PredictionModegetConflictingAltSubsets(configs *ATNConfigSet) []*BitSet {
 		var c = configs.configs[i]
 		var key = "key_" + strconv.Itoa(c.GetState().GetStateNumber()) + "/" + c.GetContext().toString()
 		var alts = configToAlts[key]
-		if alts != nil {
+		if alts == nil {
 			alts = NewBitSet()
 			configToAlts[key] = alts
 		}