diff --git a/modules/parsoid-styles/ext.cite.style.crh_latn.less b/modules/parsoid-styles/ext.cite.style.crh-latn.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.crh_latn.less
rename to modules/parsoid-styles/ext.cite.style.crh-latn.less
diff --git a/modules/parsoid-styles/ext.cite.style.kk_arab.less b/modules/parsoid-styles/ext.cite.style.kk-arab.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.kk_arab.less
rename to modules/parsoid-styles/ext.cite.style.kk-arab.less
diff --git a/modules/parsoid-styles/ext.cite.style.kk_cyrl.less b/modules/parsoid-styles/ext.cite.style.kk-cyrl.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.kk_cyrl.less
rename to modules/parsoid-styles/ext.cite.style.kk-cyrl.less
diff --git a/modules/parsoid-styles/ext.cite.style.ks_arab.less b/modules/parsoid-styles/ext.cite.style.ks-arab.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.ks_arab.less
rename to modules/parsoid-styles/ext.cite.style.ks-arab.less
diff --git a/modules/parsoid-styles/ext.cite.style.ks_deva.less b/modules/parsoid-styles/ext.cite.style.ks-deva.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.ks_deva.less
rename to modules/parsoid-styles/ext.cite.style.ks-deva.less
diff --git a/modules/parsoid-styles/ext.cite.style.ku_arab.less b/modules/parsoid-styles/ext.cite.style.ku-arab.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.ku_arab.less
rename to modules/parsoid-styles/ext.cite.style.ku-arab.less
diff --git a/modules/parsoid-styles/ext.cite.style.ku_latn.less b/modules/parsoid-styles/ext.cite.style.ku-latn.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.ku_latn.less
rename to modules/parsoid-styles/ext.cite.style.ku-latn.less
diff --git a/modules/parsoid-styles/ext.cite.style.pt_br.less b/modules/parsoid-styles/ext.cite.style.pt-br.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.pt_br.less
rename to modules/parsoid-styles/ext.cite.style.pt-br.less
diff --git a/modules/parsoid-styles/ext.cite.style.skr_arab.less b/modules/parsoid-styles/ext.cite.style.skr-arab.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.skr_arab.less
rename to modules/parsoid-styles/ext.cite.style.skr-arab.less
diff --git a/modules/parsoid-styles/ext.cite.style.sr_ec.less b/modules/parsoid-styles/ext.cite.style.sr-ec.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.sr_ec.less
rename to modules/parsoid-styles/ext.cite.style.sr-ec.less
diff --git a/modules/parsoid-styles/ext.cite.style.sr_el.less b/modules/parsoid-styles/ext.cite.style.sr-el.less
similarity index 100%
rename from modules/parsoid-styles/ext.cite.style.sr_el.less
rename to modules/parsoid-styles/ext.cite.style.sr-el.less
diff --git a/src/ResourceLoader/CiteCSSFileModule.php b/src/ResourceLoader/CiteCSSFileModule.php
index 1374c938b..d2bf6d163 100644
--- a/src/ResourceLoader/CiteCSSFileModule.php
+++ b/src/ResourceLoader/CiteCSSFileModule.php
@@ -27,7 +27,7 @@ class CiteCSSFileModule extends FileModule {
 		// Get the content language code, and all the fallbacks. The first that
 		// has a ext.cite.style.<lang code>.css file present will be used.
 		foreach ( [ $contLang->getCode(), ...$contLang->getFallbackLanguages() ] as $lang ) {
-			$langStyleFile = 'ext.cite.style.' . strtr( $lang, '-', '_' ) . '.less';
+			$langStyleFile = "ext.cite.style.$lang.less";
 			if ( file_exists( $this->getLocalPath( $langStyleFile ) ) ) {
 				$this->styles[] = $langStyleFile;
 				break;