diff --git a/DESCRIPTION b/DESCRIPTION
index 2fa3159..77700cb 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -22,7 +22,7 @@ Imports:
     grDevices,
     htmltools,
     jsonlite,
-    pillar,
+    pillar (>= 1.4.0),
     base64enc
 Suggests:
     methods,
@@ -30,7 +30,7 @@ Suggests:
     Cairo,
     stringr,
     testthat,
-    diffobj,
+    diffobj (>= 0.2.3),
     leaflet
 Enhances:
     data.table,
diff --git a/R/repr_matrix_df.r b/R/repr_matrix_df.r
index c2b9944..d134491 100644
--- a/R/repr_matrix_df.r
+++ b/R/repr_matrix_df.r
@@ -150,10 +150,10 @@ repr_matrix_generic <- function(
 	is_matrix <- !is.list(x)
 	cls <-
 		if (!is.null(caption_override)) caption_override
-		else if (!is.object(x)) class(x)[[1]]
-		else type_sum(x)
+		else if (class(x)[[1]] == 'tbl_df') 'tibble'
+		else class(x)[[1]]
 	dims <- dim(x)
-	types <- if (is_matrix) type_sum(x) else {
+	types <- if (is_matrix) type_sum(as.vector(x)) else {
 		type_vec <- sprintf('<%s>', sapply(x, type_sum))
 		# A row limit of 3 is the minimal choice, but we only have 1 anyway
 		as.vector(ellip_limit_arr(matrix(type_vec, nrow = 1L), 3L, cols))
diff --git a/tests/testthat/helpers.r b/tests/testthat/helpers.r
index e0efeb7..bb9a678 100644
--- a/tests/testthat/helpers.r
+++ b/tests/testthat/helpers.r
@@ -8,12 +8,10 @@ expect_id_text <- function(object, expected) {
 		object   <- strsplit(object,   '\n')[[1]]
 		expected <- strsplit(expected, '\n')[[1]]
 	}
-	if (!identical(object, expected)) {
-		dif <- diffobj::diffChr(object, expected, format = 'ansi256', ignore.white.space = FALSE, interactive = FALSE)
-		fail_msg <- as.character(dif)
-		if (!one_element) fail_msg <- paste(format(seq_along(fail_msg)), fail_msg)
-		expect(!any(dif), fail_msg)
-	}
+	dif <- diffobj::diffChr(object, expected, format = 'ansi256', ignore.white.space = FALSE, interactive = FALSE)
+	fail_msg <- as.character(dif)
+	if (!one_element) fail_msg <- paste(format(seq_along(fail_msg)), fail_msg)
+	expect(!any(dif), fail_msg)
 }
 
 expect_equivalent_string <- function(result, expectation){
diff --git a/tests/testthat/test_repr_array_df.r b/tests/testthat/test_repr_array_df.r
index bd203e1..914f0d7 100644
--- a/tests/testthat/test_repr_array_df.r
+++ b/tests/testthat/test_repr_array_df.r
@@ -112,7 +112,7 @@ test_that('matrices in data.frames work', {
 	expect_id_text(repr_markdown(df), '
 A data.frame: 3 \u00D7 5
 
-| Species &lt;fct&gt; | Sepal.Length &lt;dbl&gt; | Sepal.Width &lt;dbl&gt; | Petal.Length &lt;dbl&gt; | Petal.Width &lt;dbl&gt; |
+| Species &lt;fct&gt; | Sepal.Length &lt;dbl[,2]&gt; | Sepal.Width &lt;dbl[,2]&gt; | Petal.Length &lt;dbl[,2]&gt; | Petal.Width &lt;dbl[,2]&gt; |
 |---|---|---|---|---|
 | setosa     | 4.3, 5.8 | 2.3, 4.4 | 1.0, 1.9 | 0.1, 0.6 |
 | versicolor | 4.9, 7.0 | 2.0, 3.4 | 3.0, 5.1 | 1.0, 1.8 |