diff --git a/src/pluralMap.js b/src/pluralMap.js
index a0dd4f7..34121e6 100644
--- a/src/pluralMap.js
+++ b/src/pluralMap.js
@@ -36,6 +36,7 @@ const pluralMap = {
   ru: RUSSIAN,
 
   cs: CZECH,
+  sk: CZECH,
 
   pl: POLISH,