diff --git a/R/cnd-message.R b/R/cnd-message.R
index 2e3771bcc3..d0a8230889 100644
--- a/R/cnd-message.R
+++ b/R/cnd-message.R
@@ -298,6 +298,16 @@ on_load({
     # to `cnd_message()`
     NextMethod()
   })
+
+  s3_register("knitr::knit_cnd_format", "rlang_message", function(cnd) {
+    cnd_message(cnd, prefix = FALSE)
+  })
+  s3_register("knitr::knit_cnd_format", "rlang_warning", function(cnd) {
+    cnd_message(cnd, prefix = TRUE)
+  })
+  s3_register("knitr::knit_cnd_format", "rlang_error", function(cnd) {
+    cnd_message(cnd, prefix = TRUE)
+  })
 })
 
 #' Format bullets for error messages
diff --git a/tests/testthat/_snaps/cnd-abort.md b/tests/testthat/_snaps/cnd-abort.md
index 2d4898fe17..8a2f22c2ea 100644
--- a/tests/testthat/_snaps/cnd-abort.md
+++ b/tests/testthat/_snaps/cnd-abort.md
@@ -509,7 +509,8 @@
             call = call("f")
           )
       
-          ## Warning in f(): Message.
+          ## Warning in `f()`:
+          ##   Message.
           ##   x Bullet A
           ##   i Bullet B.
           ## Caused by error in `foo()`: