diff --git a/testsuite/css/parser/Makefile.am b/testsuite/css/parser/Makefile.am
index ec5516240d..5e0577932d 100644
--- a/testsuite/css/parser/Makefile.am
+++ b/testsuite/css/parser/Makefile.am
@@ -320,6 +320,9 @@ test_data = \
 	no-semicolon.ref.css \
 	nth-child.css \
 	nth-child.ref.css \
+	property-name-errors.css \
+	property-name-errors.errors \
+	property-name-errors.ref.css \
 	pseudo-classes-unknown.css \
 	pseudo-classes-unknown.errors \
 	pseudo-classes-unknown.ref.css \
diff --git a/testsuite/css/parser/property-name-errors.css b/testsuite/css/parser/property-name-errors.css
new file mode 100644
index 0000000000..b95ff30667
--- /dev/null
+++ b/testsuite/css/parser/property-name-errors.css
@@ -0,0 +1,4 @@
+* {
+  nonexisting-property: something;
+  -gtk-nonexisting-property: "something else";
+}
diff --git a/testsuite/css/parser/property-name-errors.errors b/testsuite/css/parser/property-name-errors.errors
new file mode 100644
index 0000000000..5d5c4d0647
--- /dev/null
+++ b/testsuite/css/parser/property-name-errors.errors
@@ -0,0 +1,2 @@
+property-name-errors.css:2: error: GTK_CSS_PROVIDER_ERROR_NAME
+property-name-errors.css:3: error: GTK_CSS_PROVIDER_ERROR_NAME
diff --git a/testsuite/css/parser/property-name-errors.ref.css b/testsuite/css/parser/property-name-errors.ref.css
new file mode 100644
index 0000000000..e69de29bb2