diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8a26ae6c7..53e9f494e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -513,6 +513,7 @@ if(NOT CALAMARES_RELEASE_MODE)
     list(APPEND CALAMARES_TRANSLATION_LANGUAGES ${_tx_incomplete})
 endif()
 list(SORT CALAMARES_TRANSLATION_LANGUAGES)
+list(REMOVE_DUPLICATES CALAMARES_TRANSLATION_LANGUAGES)
 
 add_subdirectory(lang) # i18n tools