diff --git a/Source/ChangeTracker/CBLChangeTracker.m b/Source/ChangeTracker/CBLChangeTracker.m
index 74e5b140f..4a3c41656 100644
--- a/Source/ChangeTracker/CBLChangeTracker.m
+++ b/Source/ChangeTracker/CBLChangeTracker.m
@@ -107,6 +107,9 @@ - (NSString*) changesFeedPath {
         if ([seq isKindOfClass: [NSArray class]] || [seq isKindOfClass: [NSDictionary class]])
             seq = [CBLJSON stringWithJSONObject: seq options: 0 error: nil];
         [path appendFormat: @"&since=%@", CBLEscapeURLParam([seq description])];
+    } else {
+        // On first replication we can skip getting deleted docs. (SG enhancement in ver. 1.2)
+        [path appendString: @"&active_only=true"];
     }
     if (_limit > 0)
         [path appendFormat: @"&limit=%u", _limit];
@@ -162,6 +165,7 @@ - (NSData*) changesFeedPOSTBody {
     NSMutableDictionary* post = $mdict({@"feed", self.feed},
                                        {@"heartbeat", @(round(_heartbeat*1000.0))},
                                        {@"style", (_includeConflicts ? @"all_docs" : nil)},
+                                       {@"active_only", (since ? nil : @YES)},
                                        {@"since", since},
                                        {@"limit", (_limit > 0 ? @(_limit) : nil)},
                                        {@"filter", filterName},