diff --git a/plugins/markdown/src/org/intellij/plugins/markdown/folding/MarkdownFoldingBuilder.java b/plugins/markdown/src/org/intellij/plugins/markdown/folding/MarkdownFoldingBuilder.java
index b0b3a210dcec..b0f2ae01a0dc 100644
--- a/plugins/markdown/src/org/intellij/plugins/markdown/folding/MarkdownFoldingBuilder.java
+++ b/plugins/markdown/src/org/intellij/plugins/markdown/folding/MarkdownFoldingBuilder.java
@@ -49,6 +49,9 @@ public class MarkdownFoldingBuilder extends CustomFoldingBuilder implements Dumb
                                           @NotNull PsiElement root,
                                           @NotNull Document document,
                                           boolean quick) {
+    if (root.getLanguage() != root.getContainingFile().getViewProvider().getBaseLanguage()) {
+      return;
+    }
     root.accept(new MarkdownElementVisitor() {
       @Override
       public void visitElement(@NotNull PsiElement element) {