diff --git a/Source/ASTextNode.mm b/Source/ASTextNode.mm
index 522ebabedd..ccbed9c078 100644
--- a/Source/ASTextNode.mm
+++ b/Source/ASTextNode.mm
@@ -769,7 +769,7 @@ static NSArray *DefaultLinkAttributeNames = @[ NSLinkAttributeName ];
 
       if (highlightTargetLayer != nil) {
         ASDN::MutexLocker l(__instanceLock__);
-        ASTextKitRenderer *renderer = [self _renderer];
+        ASTextKitRenderer *renderer = [self _locked_renderer];
 
         NSArray *highlightRects = [renderer rectsForTextRange:highlightRange measureOption:ASTextKitRendererMeasureOptionBlock];
         NSMutableArray *converted = [NSMutableArray arrayWithCapacity:highlightRects.count];