diff --git a/src/utils.js b/src/utils.js
index 76382aa..b6048f0 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -105,6 +105,9 @@ function validateImagesWithAnchorParent(parent, image) {
     image.classList.add("github-a11y-img-invalid-alt");
   }
 
+  if (parent.querySelector('.github-a11y-img-caption')) {
+    return;
+  }
   const subtitle = createSubtitleElement();
   parent.classList.add("github-a11y-img-container");
 
@@ -127,6 +130,9 @@ function validateImagesWithNonAnchorParent(parent, image) {
   if (invalidAltText(altText)) {
     image.classList.add("github-a11y-img-invalid-alt");
   }
+  if (parent.querySelector('.github-a11y-img-caption')) {
+    return;
+  }
   const subtitle = createSubtitleElement();
   parent.classList.add("github-a11y-img-container");