diff --git a/extension.json b/extension.json
index 9dcde8b64..4df0481f8 100644
--- a/extension.json
+++ b/extension.json
@@ -47,8 +47,8 @@
 	"ResourceModules": {
 		"ext.cite.styles": {
 			"styles": {
-				"ext.cite.styles.css": {},
-				"ext.cite.print.css": {
+				"ext.cite.styles.less": {},
+				"ext.cite.print.less": {
 					"media": "print"
 				}
 			},
@@ -58,7 +58,7 @@
 		},
 		"ext.cite.parsoid.styles": {
 			"class": "Cite\\ResourceLoader\\CiteCSSFileModule",
-			"styles": "ext.cite.parsoid.styles.css"
+			"styles": "ext.cite.parsoid.styles.less"
 		},
 		"ext.cite.visualEditor.core": {
 			"localBasePath": "modules/ve-cite",
@@ -209,8 +209,8 @@
 				"ext.cite.tracking.js"
 			],
 			"styles": [
-				"ext.cite.a11y.css",
-				"ext.cite.highlighting.css"
+				"ext.cite.a11y.less",
+				"ext.cite.highlighting.less"
 			],
 			"messages": [
 				"cite_references_link_accessibility_label",
diff --git a/modules/ext.cite.a11y.css b/modules/ext.cite.a11y.less
similarity index 100%
rename from modules/ext.cite.a11y.css
rename to modules/ext.cite.a11y.less
diff --git a/modules/ext.cite.highlighting.css b/modules/ext.cite.highlighting.less
similarity index 100%
rename from modules/ext.cite.highlighting.css
rename to modules/ext.cite.highlighting.less
diff --git a/modules/ext.cite.parsoid.styles.css b/modules/ext.cite.parsoid.styles.less
similarity index 97%
rename from modules/ext.cite.parsoid.styles.css
rename to modules/ext.cite.parsoid.styles.less
index ab89be9d6..bab530b8b 100644
--- a/modules/ext.cite.parsoid.styles.css
+++ b/modules/ext.cite.parsoid.styles.less
@@ -37,10 +37,10 @@ ol.mw-references {
 	 * We have 2 counters for Parsoid HTML for different functionality.
 	 * Make sure both are reset!
 	 *
-	 * NOTE: This rule is a duplicate of the one present in ext.cite.styles.css
+	 * NOTE: This rule is a duplicate of the one present in ext.cite.styles.less
 	 * but duplicating it here ensures no matter how the rules and files are
 	 * refactored and which rule ends up applying on the loaded doc, both
-	 * counters continue to be incremented. As of now, the rule in ext.cite.styles.css
+	 * counters continue to be incremented. As of now, the rule in ext.cite.styles.less
 	 * is the one that seems to be winning.
 	 **/
 	counter-reset: mw-ref-extends-parent mw-references list-item;
@@ -51,10 +51,10 @@ ol.mw-references > li {
 	 * We have 2 counters for Parsoid HTML for different functionality.
 	 * Make sure both are incremented!
 	 *
-	 * NOTE: This rule is a duplicate of the one present in ext.cite.styles.css
+	 * NOTE: This rule is a duplicate of the one present in ext.cite.styles.less
 	 * but duplicating it here ensures no matter how the rules and files are
 	 * refactored and which rule ends up applying on the loaded doc, both
-	 * counters continue to be incremented. As of now, the rule in ext.cite.styles.css
+	 * counters continue to be incremented. As of now, the rule in ext.cite.styles.less
 	 * is the one that seems to be winning.
 	 **/
 	counter-increment: mw-ref-extends-parent mw-references;
diff --git a/modules/ext.cite.print.css b/modules/ext.cite.print.less
similarity index 100%
rename from modules/ext.cite.print.css
rename to modules/ext.cite.print.less
diff --git a/modules/ext.cite.styles.css b/modules/ext.cite.styles.less
similarity index 100%
rename from modules/ext.cite.styles.css
rename to modules/ext.cite.styles.less
diff --git a/tests/parser/citeParserTests.txt b/tests/parser/citeParserTests.txt
index 2dab9474c..43b9f9fcf 100644
--- a/tests/parser/citeParserTests.txt
+++ b/tests/parser/citeParserTests.txt
@@ -4,7 +4,7 @@ version=2
 
 # NOTE about Parsoid HTML for cite tests with follows.
 # Parsoid HTML has <sup>s for follows because it needs to be able to roundtrip it back.
-# This output is hidden from read views via CSS in ext.cite.style.css.
+# This output is hidden from read views via CSS in ext.cite.parsoid.styles.less.
 
 # Force the test runner to ensure the extension is loaded
 !! hooks