diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InMemoryFileIndex.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InMemoryFileIndex.scala
index ec258e2e46459..899adcae87ef2 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InMemoryFileIndex.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InMemoryFileIndex.scala
@@ -103,7 +103,8 @@ class InMemoryFileIndex(
   }
 
   override def equals(other: Any): Boolean = other match {
-    case hdfs: InMemoryFileIndex => rootPaths.sorted == hdfs.rootPaths.sorted
+    case hdfs: InMemoryFileIndex if rootPaths.size == hdfs.rootPaths.size =>
+      rootPaths.sorted == hdfs.rootPaths.sorted
     case _ => false
   }