diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonBySchemaObjectAnnotator.java b/json/src/com/jetbrains/jsonSchema/impl/JsonBySchemaObjectAnnotator.java
index 22723c4b4498..597534aa7cf6 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonBySchemaObjectAnnotator.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonBySchemaObjectAnnotator.java
@@ -356,14 +356,26 @@ public class JsonBySchemaObjectAnnotator implements Annotator {
     private void checkForEnum(PsiElement value, JsonSchemaObject schema) {
       //enum values + pattern -> don't check enum values
       if (schema.getEnum() == null || schema.getPattern() != null) return;
-      final String text = value.getText();
+      final String text = StringUtil.notNullize(value.getText());
       final List<Object> objects = schema.getEnum();
       for (Object object : objects) {
-        if (object.toString().equalsIgnoreCase(text)) return;
+        if (myWalker.onlyDoubleQuotesForStringLiterals()) {
+          if (object.toString().equalsIgnoreCase(text)) return;
+        } else {
+          if (equalsIgnoreQuotesAndCase(object.toString(), text)) return;
+        }
       }
       error("Value should be one of: [" + StringUtil.join(objects, o -> o.toString(), ", ") + "]", value);
     }
 
+    private static boolean equalsIgnoreQuotesAndCase(@NotNull final String s1, @NotNull final String s2) {
+      final boolean quoted1 = StringUtil.isQuotedString(s1);
+      final boolean quoted2 = StringUtil.isQuotedString(s2);
+      if (quoted1 != quoted2) return false;
+      if (!quoted1) return s1.equalsIgnoreCase(s2);
+      return StringUtil.unquoteString(s1).equalsIgnoreCase(StringUtil.unquoteString(s2));
+    }
+
     private void checkArray(JsonValueAdapter value, JsonSchemaObject schema) {
       final JsonArrayValueAdapter asArray = value.getAsArray();
       if (asArray == null) return;
diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonLikePsiWalker.java b/json/src/com/jetbrains/jsonSchema/impl/JsonLikePsiWalker.java
index 36e516bc7c3d..7aebd2b1a8df 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonLikePsiWalker.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonLikePsiWalker.java
@@ -32,6 +32,7 @@ public interface JsonLikePsiWalker {
   PsiElement goUpToCheckable(@NotNull final PsiElement element);
   List<JsonSchemaWalker.Step> findPosition(@NotNull final PsiElement element, boolean isName, boolean forceLastTransition);
   boolean isNameQuoted();
+  boolean onlyDoubleQuotesForStringLiterals();
   boolean hasPropertiesBehindAndNoComma(@NotNull PsiElement element);
   Set<String> getPropertyNamesOfParentObject(@NotNull PsiElement element);
   @Nullable JsonPropertyAdapter getParentPropertyAdapter(@NotNull PsiElement element);
diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonOriginalPsiWalker.java b/json/src/com/jetbrains/jsonSchema/impl/JsonOriginalPsiWalker.java
index 66c12fe4d211..6278d281c7ab 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonOriginalPsiWalker.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonOriginalPsiWalker.java
@@ -121,6 +121,11 @@ public class JsonOriginalPsiWalker implements JsonLikePsiWalker {
     return true;
   }
 
+  @Override
+  public boolean onlyDoubleQuotesForStringLiterals() {
+    return true;
+  }
+
   @Override
   public boolean hasPropertiesBehindAndNoComma(@NotNull PsiElement element) {
     PsiElement current = element instanceof JsonProperty ? element : PsiTreeUtil.getParentOfType(element, JsonProperty.class);