diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index d46530700f..2322b3da88 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -2691,3 +2691,12 @@ fieldset.permissions .padding {
 	word-wrap: break-word;
 	word-break: break-all;
 }
+
+/* stylelint-disable declaration-property-unit-whitelist */
+.emoji {
+	min-height: 18px;
+	min-width: 18px;
+	height: 1em;
+	width: 1em;
+}
+/* stylelint-enable declaration-property-unit-whitelist */
diff --git a/phpBB/styles/prosilver/theme/print.css b/phpBB/styles/prosilver/theme/print.css
index f8fefc21ae..192805d8e7 100644
--- a/phpBB/styles/prosilver/theme/print.css
+++ b/phpBB/styles/prosilver/theme/print.css
@@ -213,4 +213,12 @@ ul {
 .codebox p {
 	display: none;
 }
-/* stylelint-enable */
+
+/* stylelint-disable declaration-property-unit-whitelist */
+.emoji {
+	min-height: 18px;
+	min-width: 18px;
+	height: 1em;
+	width: 1em;
+}
+/* stylelint-enable declaration-property-unit-whitelist */