diff --git a/tool/src/org/antlr/v4/parse/ANTLRLexer.g b/tool/src/org/antlr/v4/parse/ANTLRLexer.g
index 6e01ae71f..7c89ae2c1 100644
--- a/tool/src/org/antlr/v4/parse/ANTLRLexer.g
+++ b/tool/src/org/antlr/v4/parse/ANTLRLexer.g
@@ -298,15 +298,16 @@ ARG_ACTION
 //
 ACTION
 	:	NESTED_ACTION
-		('?' {$type = SEMPRED;} )?
-		(	'=>' // v3 gated sempred
-			{
-			Token t = new CommonToken(input, state.type, state.channel, state.tokenStartCharIndex, getCharIndex()-1);
-			t.setLine(state.tokenStartLine);
-			t.setText(state.text);
-			t.setCharPositionInLine(state.tokenStartCharPositionInLine);
-            grammarError(ErrorType.V3_GATED_SEMPRED, t);
-			}
+		(	'?' {$type = SEMPRED;}
+			(	'=>' // v3 gated sempred
+				{
+				Token t = new CommonToken(input, state.type, state.channel, state.tokenStartCharIndex, getCharIndex()-1);
+				t.setLine(state.tokenStartLine);
+				t.setText(state.text);
+				t.setCharPositionInLine(state.tokenStartCharPositionInLine);
+				grammarError(ErrorType.V3_GATED_SEMPRED, t);
+				}
+			)?
 		)?
 	;