diff --git a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/WildcardCastConversion.java b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/WildcardCastConversion.java
index 2d29970dbc02..389db6c27f05 100644
--- a/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/WildcardCastConversion.java
+++ b/java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/WildcardCastConversion.java
@@ -475,6 +475,27 @@ public class Test {
         }
       }
     }
+
+    //IDEA-63447
+    void testUnboundWildcardWithArrayTypes() {
+        class IUWWAT{
+            private <T> void method1(T[][] matrix) {
+                final Class<T[]> type = (Class<T[]>) matrix.getClass().getComponentType();
+            }
+
+            private <T> void method2(T[][] matrix) {
+                final Class<Object> type = (Class<Object>) matrix.getClass().getComponentType();
+            }
+
+            private <T> void method3(T[][] matrix) {
+                final Class<Object[]> type = (Class<Object[]>) matrix.getClass().getComponentType();
+            }
+
+            private <T> void method4(T[][] matrix) {
+                final Class<Object[][]> type = (Class<Object[][]>) matrix.getClass().getComponentType();
+            }
+        }
+    }
 }
 
 class W<T> {}
diff --git a/java/openapi/src/com/intellij/psi/util/TypesDistinctProver.java b/java/openapi/src/com/intellij/psi/util/TypesDistinctProver.java
index 37f7ab9e2e8a..8484ef5f0c26 100644
--- a/java/openapi/src/com/intellij/psi/util/TypesDistinctProver.java
+++ b/java/openapi/src/com/intellij/psi/util/TypesDistinctProver.java
@@ -196,6 +196,9 @@ public class TypesDistinctProver {
     else if (bound instanceof PsiClassType) {
       return !possibleClasses.contains(((PsiClassType)bound).resolve());
     }
+    else if (bound instanceof PsiWildcardType && !((PsiWildcardType)bound).isBounded()) {
+      return false;
+    }
     return true;
   }
 }