diff --git a/cmake/build-pofiles.cmake b/cmake/build-pofiles.cmake
--- a/cmake/build-pofiles.cmake
+++ b/cmake/build-pofiles.cmake
@@ -31,7 +31,7 @@
 ProcessorCount(numberOfProcesses)
 
 set(i 0)
-set(commands)
+set(commands "")
 
 function(_processCommands)
     if(NOT commands)
@@ -62,6 +62,7 @@
     if(i EQUAL ${numberOfProcesses})
         _processCommands()
         set(i 0)
+        set(commands "")
     endif()
 endforeach()