diff --git a/phpBB/styles/prosilver/theme/print.css b/phpBB/styles/prosilver/theme/print.css
index e1ddaca308..a83270b742 100644
--- a/phpBB/styles/prosilver/theme/print.css
+++ b/phpBB/styles/prosilver/theme/print.css
@@ -138,9 +138,11 @@ div.spacer { clear: both; }
 
 .codebox p { display: none; }
 
+/* stylelint-disable declaration-property-unit-whitelist */
 .emoji {
 	min-height: 18px;
 	min-width: 18px;
 	height: 1em;
 	width: 1em;
 }
+/* stylelint-enable declaration-property-unit-whitelist */