diff --git a/src/relations/RelationUtils.js b/src/relations/RelationUtils.js
index 8ff999c..d439f3b 100644
--- a/src/relations/RelationUtils.js
+++ b/src/relations/RelationUtils.js
@@ -17,7 +17,7 @@ export const getNodeForEvent = function(evt) {
   const sortByQuoteLengthDesc = annotations => 
     annotations.sort((a, b) => a.quote.length - b.quote.length);
 
-  const annotationSpan = evt.target.closest('.annotation');
+  const annotationSpan = evt.target.closest('.r6o-annotation');
 
   if (annotationSpan) {
     // All stacked annotation spans
@@ -27,7 +27,7 @@ export const getNodeForEvent = function(evt) {
     const annotation = sortByQuoteLengthDesc(spans.map(span => span.annotation))[0];
 
     // ALL spans for this annotation (not just the hovered one)
-    const elements = document.querySelectorAll(`.annotation[data-id="${annotation.id}"]`);
+    const elements = document.querySelectorAll(`.r6o-annotation[data-id="${annotation.id}"]`);
     
     return { annotation, elements: Array.from(elements) };    
   }
@@ -50,6 +50,6 @@ export const getAnnotationSpansRecursive = function(element, s) {
 
   const parent = element.parentNode;
 
-  return parent.classList.contains('annotation') ?
+  return parent.classList.contains('r6o-annotation') ?
     getAnnotationSpansRecursive(parent, spans) : spans;
 }
\ No newline at end of file
diff --git a/src/relations/drawing/DrawingTool.js b/src/relations/drawing/DrawingTool.js
index 399f85f..bc03f54 100644
--- a/src/relations/drawing/DrawingTool.js
+++ b/src/relations/drawing/DrawingTool.js
@@ -99,7 +99,7 @@ export default class DrawingTool extends EventEmitter {
   }
 
   /** Emphasise hovered annotation **/
-  onEnterAnnotation = delegatingHandler('.annotation', evt => {
+  onEnterAnnotation = delegatingHandler('.r6o-annotation', evt => {
     if (this.currentHover) 
       this.hover();
 
@@ -107,7 +107,7 @@ export default class DrawingTool extends EventEmitter {
   });
 
   /** Clear hover emphasis **/
-  onLeaveAnnotation = delegatingHandler('.annotation', evt => {
+  onLeaveAnnotation = delegatingHandler('.r6o-annotation', evt => {
     this.hover();
   });