diff --git a/third_party/src/main/java/com/jetbrains/lang/dart/DartTokenTypesSets.java b/third_party/src/main/java/com/jetbrains/lang/dart/DartTokenTypesSets.java
index 984207675..98aaf0639 100644
--- a/third_party/src/main/java/com/jetbrains/lang/dart/DartTokenTypesSets.java
+++ b/third_party/src/main/java/com/jetbrains/lang/dart/DartTokenTypesSets.java
@@ -239,11 +239,6 @@ public DartLazyParseableBlockElementType() {
       super("LAZY_PARSEABLE_BLOCK", DartLanguage.INSTANCE);
     }
 
-    @Override
-    public boolean isParsable(final @NotNull CharSequence buffer, final @NotNull Language fileLanguage, final @NotNull Project project) {
-      return PsiBuilderUtil.hasProperBraceBalance(buffer, new DartLexer(), LBRACE, RBRACE);
-    }
-
     @Override
     public @Nullable ASTNode createNode(final @NotNull CharSequence text) {
       return new DartLazyParseableBlockImpl(this, text);