diff --git a/src/lang/czech.txt b/src/lang/czech.txt
--- a/src/lang/czech.txt
+++ b/src/lang/czech.txt
@@ -3,7 +3,7 @@
 ##isocode cs_CZ
 ##winlangid 0x0405
 ##grflangid 0x15
-##plural 6
+##plural 10
 ##case nom gen dat acc voc loc ins big small
 ##gender m f n