diff --git a/testsuite/reftests/css-rem-label-size.css b/testsuite/reftests/css-rem-label-size.css
new file mode 100644
index 0000000000..d2c648c682
--- /dev/null
+++ b/testsuite/reftests/css-rem-label-size.css
@@ -0,0 +1,11 @@
+* {
+  color: tomato;
+}
+
+.ref {
+  font-size: 2em;
+}
+
+.test label {
+  font-size: 2rem;
+}
diff --git a/testsuite/reftests/css-rem-label-size.ref.ui b/testsuite/reftests/css-rem-label-size.ref.ui
new file mode 100644
index 0000000000..eef675c6ee
--- /dev/null
+++ b/testsuite/reftests/css-rem-label-size.ref.ui
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.20.0 -->
+<interface>
+  <requires lib="gtk+" version="3.20"/>
+  <object class="GtkWindow">
+    <property name="can_focus">False</property>
+    <property name="type">popup</property>
+    <child>
+      <object class="GtkLabel">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="label" translatable="yes">███</property>
+      </object>
+    </child>
+    <style>
+      <class name="ref"/>
+    </style>
+  </object>
+</interface>
diff --git a/testsuite/reftests/css-rem-label-size.ui b/testsuite/reftests/css-rem-label-size.ui
new file mode 100644
index 0000000000..957716ee86
--- /dev/null
+++ b/testsuite/reftests/css-rem-label-size.ui
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.20.0 -->
+<interface>
+  <requires lib="gtk+" version="3.20"/>
+  <object class="GtkWindow">
+    <property name="can_focus">False</property>
+    <property name="type">popup</property>
+    <child>
+      <object class="GtkLabel">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="label" translatable="yes">███</property>
+      </object>
+    </child>
+    <style>
+      <class name="test"/>
+    </style>
+  </object>
+</interface>