diff --git a/testsuite/css/parser/Makefile.am b/testsuite/css/parser/Makefile.am
index 3120de0388..ec5516240d 100644
--- a/testsuite/css/parser/Makefile.am
+++ b/testsuite/css/parser/Makefile.am
@@ -337,6 +337,7 @@ test_data = \
 	string-values.ref.css \
 	test.png \
 	text-shadow-invalid-but-worked-in-3.12.css \
+	text-shadow-invalid-but-worked-in-3.12.errors \
 	text-shadow-invalid-but-worked-in-3.12.ref.css \
 	transition.css \
 	transition.ref.css \
diff --git a/testsuite/css/parser/text-shadow-invalid-but-worked-in-3.12.errors b/testsuite/css/parser/text-shadow-invalid-but-worked-in-3.12.errors
new file mode 100644
index 0000000000..72c78ce98a
--- /dev/null
+++ b/testsuite/css/parser/text-shadow-invalid-but-worked-in-3.12.errors
@@ -0,0 +1,2 @@
+text-shadow-invalid-but-worked-in-3.12.css:2: error: GTK_CSS_PROVIDER_ERROR_SYNTAX
+text-shadow-invalid-but-worked-in-3.12.css:6: error: GTK_CSS_PROVIDER_ERROR_SYNTAX