diff --git a/lucene/core/src/java/org/apache/lucene/codecs/lucene45/Lucene45DocValuesProducer.java b/lucene/core/src/java/org/apache/lucene/codecs/lucene45/Lucene45DocValuesProducer.java
index 58f91852769..2316fc5798e 100644
--- a/lucene/core/src/java/org/apache/lucene/codecs/lucene45/Lucene45DocValuesProducer.java
+++ b/lucene/core/src/java/org/apache/lucene/codecs/lucene45/Lucene45DocValuesProducer.java
@@ -104,7 +104,7 @@ public class Lucene45DocValuesProducer extends DocValuesProducer implements Clos
       String dataName = IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, dataExtension);
       data = state.directory.openInput(dataName, state.context);
       final int version2 = CodecUtil.checkHeader(data, dataCodec, 
-                                                 Lucene45DocValuesFormat.VERSION_CURRENT,
+                                                 Lucene45DocValuesFormat.VERSION_START,
                                                  Lucene45DocValuesFormat.VERSION_CURRENT);
       if (version != version2) {
         throw new CorruptIndexException("Format versions mismatch");
diff --git a/lucene/core/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java b/lucene/core/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java
index e9298e277cd..a46ef934654 100644
--- a/lucene/core/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java
+++ b/lucene/core/src/test/org/apache/lucene/index/TestBackwardsCompatibility.java
@@ -164,8 +164,8 @@ public class TestBackwardsCompatibility extends LuceneTestCase {
                                     "42.cfs",
                                     "42.nocfs",
                                     // TODO: these are on 4x, but something is wrong (they seem to be a too old DV format):
-                                    //"45.cfs",
-                                    //"45.nocfs",
+                                    "45.cfs",
+                                    "45.nocfs",
                                     "461.cfs",
                                     "461.nocfs",
   };
diff --git a/lucene/core/src/test/org/apache/lucene/index/index.45.cfs.zip b/lucene/core/src/test/org/apache/lucene/index/index.45.cfs.zip
new file mode 100644
index 00000000000..10a8a1a74b2
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diff --git a/lucene/core/src/test/org/apache/lucene/index/index.45.nocfs.zip b/lucene/core/src/test/org/apache/lucene/index/index.45.nocfs.zip
new file mode 100644
index 00000000000..7825e2ae393
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