diff --git a/reactos/base/applications/calc/lang/cz-CZ.rc b/reactos/base/applications/calc/lang/cs-CZ.rc
similarity index 100%
rename from reactos/base/applications/calc/lang/cz-CZ.rc
rename to reactos/base/applications/calc/lang/cs-CZ.rc
diff --git a/reactos/base/applications/calc/rsrc.rc b/reactos/base/applications/calc/rsrc.rc
index 155ed55390b..dff8be04d28 100644
--- a/reactos/base/applications/calc/rsrc.rc
+++ b/reactos/base/applications/calc/rsrc.rc
@@ -23,7 +23,7 @@
 
 IDI_CALCICON ICON "calculator.ico"
 
-#include "lang/cz-CZ.rc"
+#include "lang/cs-CZ.rc"
 #include "lang/de-DE.rc"
 #include "lang/el-GR.rc"
 #include "lang/en-US.rc"
diff --git a/reactos/base/applications/control/lang/cz-CZ.rc b/reactos/base/applications/control/lang/cs-CZ.rc
similarity index 100%
rename from reactos/base/applications/control/lang/cz-CZ.rc
rename to reactos/base/applications/control/lang/cs-CZ.rc
diff --git a/reactos/base/applications/control/rsrc.rc b/reactos/base/applications/control/rsrc.rc
index a1b363b7100..b93d0ec68c8 100644
--- a/reactos/base/applications/control/rsrc.rc
+++ b/reactos/base/applications/control/rsrc.rc
@@ -8,7 +8,7 @@
 LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 
 /* include localised resources */
-#include "lang/cz-CZ.rc"
+#include "lang/cs-CZ.rc"
 #include "lang/da-DK.rc"
 #include "lang/de-DE.rc"
 #include "lang/el-GR.rc"