diff --git a/src/checkstyle/com/puppycrawl/tools/checkstyle/java.g b/src/checkstyle/com/puppycrawl/tools/checkstyle/java.g
index fc1878858..56a3094b1 100644
--- a/src/checkstyle/com/puppycrawl/tools/checkstyle/java.g
+++ b/src/checkstyle/com/puppycrawl/tools/checkstyle/java.g
@@ -940,7 +940,7 @@ options {
 	exportVocab=GeneratedJava; // call the vocabulary "Java"
 	testLiterals=false;        // don't automatically test for literals
 	k=4;                       // four characters of lookahead
-	charVocabulary='\u0003'..'\uFFFF';
+	charVocabulary='\u0003'..'\uFFFE';
 	// without inlining some bitset tests, couldn't do unicode;
 	// I need to make ANTLR generate smaller bitsets; see
 	// bottom of JavaLexer.java
diff --git a/src/checkstyle/com/puppycrawl/tools/checkstyle/java14.g b/src/checkstyle/com/puppycrawl/tools/checkstyle/java14.g
index 0a70bc85b..e6c372938 100644
--- a/src/checkstyle/com/puppycrawl/tools/checkstyle/java14.g
+++ b/src/checkstyle/com/puppycrawl/tools/checkstyle/java14.g
@@ -59,7 +59,7 @@ options {
 	exportVocab=GeneratedJava14;    // call the vocabulary "Java14",
 	testLiterals=false;    // don't automatically test for literals
 	k=4;                   // four characters of lookahead
-	charVocabulary='\u0003'..'\uFFFF';
+	charVocabulary='\u0003'..'\uFFFE';
 	codeGenBitsetTestThreshold=20;
 }