diff --git a/src/mongo/s/chunk_diff.cpp b/src/mongo/s/chunk_diff.cpp
index a832b72..5e33d67 100644
--- a/src/mongo/s/chunk_diff.cpp
+++ b/src/mongo/s/chunk_diff.cpp
@@ -36,9 +36,12 @@
 #include "mongo/s/chunk_version.h"
 #include "mongo/util/log.h"
 #include "mongo/util/mongoutils/str.h"
+#include "mongo/util/fail_point_service.h"
 
 namespace mongo {
 
+MONGO_FP_DECLARE(invalidChunkDiff);
+
 template <class ValType>
 ConfigDiffTracker<ValType>::ConfigDiffTracker() {
     _ns.clear();
@@ -104,6 +107,10 @@ int ConfigDiffTracker<ValType>::calculateConfigDiff(OperationContext* txn,
                                                     const std::vector<ChunkType>& chunks) {
     _assertAttached();
 
+    if (MONGO_FAIL_POINT(invalidChunkDiff)) {
+        return -1;
+    }
+
     // Apply the chunk changes to the ranges and versions
     //
     // Overall idea here is to work in two steps :