diff --git a/java/java-psi-impl/src/com/intellij/lang/java/lexer/JavaLexer.java b/java/java-psi-impl/src/com/intellij/lang/java/lexer/JavaLexer.java
index 80327c7851cd..61bf07ee88b2 100644
--- a/java/java-psi-impl/src/com/intellij/lang/java/lexer/JavaLexer.java
+++ b/java/java-psi-impl/src/com/intellij/lang/java/lexer/JavaLexer.java
@@ -41,7 +41,7 @@ public final class JavaLexer extends LexerBase {
             level.isAtLeast(LanguageLevel.JDK_16) && RECORD.contentEquals(id) ||
             level.isAtLeast(LanguageLevel.JDK_14) && YIELD.contentEquals(id) ||
             (level.isAtLeast(LanguageLevel.JDK_17) && (SEALED.contentEquals(id) || PERMITS.contentEquals(id))) ||
-            level.isAtLeast(LanguageLevel.JDK_X) && WHEN.contentEquals(id)
+            level.isAtLeast(LanguageLevel.JDK_19_PREVIEW) && WHEN.contentEquals(id)
            );
   }
 
diff --git a/java/java-tests/testSrc/com/intellij/java/lexer/JavaKeywordsTest.kt b/java/java-tests/testSrc/com/intellij/java/lexer/JavaKeywordsTest.kt
index 9c60212f3590..1e734cb3d38a 100644
--- a/java/java-tests/testSrc/com/intellij/java/lexer/JavaKeywordsTest.kt
+++ b/java/java-tests/testSrc/com/intellij/java/lexer/JavaKeywordsTest.kt
@@ -19,8 +19,8 @@ class JavaKeywordsTest {
     assertTrue(JavaLexer.isSoftKeyword("sealed", LanguageLevel.JDK_17))
     assertFalse(JavaLexer.isKeyword("permits", LanguageLevel.JDK_17))
     assertTrue(JavaLexer.isSoftKeyword("permits", LanguageLevel.JDK_17))
-    assertFalse(JavaLexer.isKeyword("when", LanguageLevel.JDK_X))
-    assertTrue(JavaLexer.isSoftKeyword("when", LanguageLevel.JDK_X))
+    assertFalse(JavaLexer.isKeyword("when", LanguageLevel.JDK_19_PREVIEW))
+    assertTrue(JavaLexer.isSoftKeyword("when", LanguageLevel.JDK_19_PREVIEW))
   }
 
   @Test fun sequences() {