diff --git a/Objective-C/CBLDocument.mm b/Objective-C/CBLDocument.mm
index dc6db31d7..fa6e7c01c 100644
--- a/Objective-C/CBLDocument.mm
+++ b/Objective-C/CBLDocument.mm
@@ -201,12 +201,16 @@ - (void) replaceC4Doc: (CBLC4Document*)c4doc {
 }
 
 - (nullable NSString*) _getRevisionHistory {
+    if (!_collection) {
+        return nil;
+    }
+    
     CBL_LOCK(self) {
-        if (!_c4Doc) {
-            return nil;
-        } else {
-            return sliceResult2string(c4doc_getRevisionHistory(_c4Doc.rawDoc, UINT_MAX, nil, 0));
-        }
+        C4Error err;
+        C4Document* doc = c4coll_getDoc(_collection.c4col, _c4Doc.docID, true, kDocGetAll, &err);
+        NSString* revHistory = doc ? sliceResult2string(c4doc_getRevisionHistory(doc, UINT_MAX, nil, 0)) : nil;
+        c4doc_release(doc);
+        return revHistory;
     }
 }
 
diff --git a/Objective-C/Tests/DocumentTest.m b/Objective-C/Tests/DocumentTest.m
index 355eae474..956c9e1ac 100644
--- a/Objective-C/Tests/DocumentTest.m
+++ b/Objective-C/Tests/DocumentTest.m
@@ -2292,8 +2292,8 @@ - (void) testDocumentRevisionHistory {
     Assert([defaultCollection saveDocument:doc error: &err]);
     Assert(doc._getRevisionHistory);
     
-    CBLDocument* remoteDoc = [defaultCollection documentWithID: @"doc1" error: &err];
-    Assert(remoteDoc._getRevisionHistory);
+    doc = [[defaultCollection documentWithID: @"doc1" error: &err] toMutable];
+    Assert(doc._getRevisionHistory);
 }
 
 #pragma clang diagnostic pop
diff --git a/Swift/Tests/DocumentTest.swift b/Swift/Tests/DocumentTest.swift
index 6c09ec35e..a461b8100 100644
--- a/Swift/Tests/DocumentTest.swift
+++ b/Swift/Tests/DocumentTest.swift
@@ -1879,7 +1879,7 @@ class DocumentTest: CBLTestCase {
         try defaultCollection!.save(document: doc)
         assert(doc._getRevisionHistory() != nil)
         
-        let remoteDoc = try defaultCollection!.document(id: "doc1")!;
+        let remoteDoc = try defaultCollection!.document(id: "doc1")!.toMutable();
         assert(doc._getRevisionHistory() != nil)
     }
 }