diff --git a/R/type-asis.R b/R/type-asis.R
index 8ba2b967b..06f905490 100644
--- a/R/type-asis.R
+++ b/R/type-asis.R
@@ -35,7 +35,7 @@ vec_proxy.AsIs <- function(x, ...) {
 
 #' @export
 vec_restore.AsIs <- function(x, to, ...) {
-  asis_restore(x)
+  asis_restore(NextMethod())
 }
 
 #' @export
@@ -115,6 +115,6 @@ asis_strip <- function(x) {
 asis_restore <- function(x) {
   # Using `oldClass()` here to return `NULL` for atomics
   # so that their implicit class isn't added
-  class(x) <- c("AsIs", oldClass(x))
+  class(x) <- unique.default(c("AsIs", oldClass(x)))
   x
 }
diff --git a/tests/testthat/test-type-asis.R b/tests/testthat/test-type-asis.R
index 27da09688..d132c5961 100644
--- a/tests/testthat/test-type-asis.R
+++ b/tests/testthat/test-type-asis.R
@@ -50,6 +50,16 @@ test_that("order proxy is forwarded correctly for atomic types (#1557)", {
   expect_identical(vec_proxy_order(asis), c(1L, 2L, 1L))
 })
 
+test_that("proxy is restored correctly for non-atomic types (#1903)", {
+  x <- new_rcrd(list(x = 1:3, y = 2:4), class = "test")
+  x_ptype <- new_rcrd(list(x = integer(), y = integer()), class = "test")
+  asis <- I(x)
+  asis_ptype <- I(x_ptype)
+
+  expect_identical(vec_restore(vec_proxy(asis), asis_ptype), I(vec_restore(vec_proxy(x), x_ptype)))
+  expect_identical(vec_restore(vec_proxy(asis), asis_ptype), asis)
+})
+
 # ------------------------------------------------------------------------------
 # Coercion