diff --git a/Objective-C/Tests/VectorSearchTest+Lazy.m b/Objective-C/Tests/VectorSearchTest+Lazy.m
index e9967600e..95f30a3a8 100644
--- a/Objective-C/Tests/VectorSearchTest+Lazy.m
+++ b/Objective-C/Tests/VectorSearchTest+Lazy.m
@@ -69,9 +69,11 @@ - (CBLVectorIndexConfiguration*) lazyVectorIndexConfigWithExpression: (NSString*
     NSArray<NSNumber*>* vector;
     CBLQueryResult *result = [rs nextObject];
     if (result) {
-        id value = [result arrayAtIndex: 0];
+        CBLArray* value = [result arrayAtIndex: 0];
         if (value) {
-            vector = (NSArray<NSNumber*>*)value;
+            // Copy the values out of the fleece-backed CBLArray, which is only
+            // valid while the result set is alive:
+            vector = (NSArray<NSNumber*>*)[value toArray];
         }
     }
     return vector;