diff --git a/src/libs/3rdparty/karchive/CMakeLists.txt b/src/libs/3rdparty/karchive/CMakeLists.txt
index 26fe6ae5484..41a595d728b 100644
--- a/src/libs/3rdparty/karchive/CMakeLists.txt
+++ b/src/libs/3rdparty/karchive/CMakeLists.txt
@@ -157,12 +157,10 @@ extend_qtc_library(
 )
 
 # libLZMA support
-if (NOT QTC_USE_SYSTEM_LZMA)
-    include (CheckTypeSize)
-    include (CheckIncludeFile)
-    CHECK_TYPE_SIZE("size_t"     SIZEOF_SIZE_T)
-    CHECK_INCLUDE_FILE("stdbool.h" HAVE_STDBOOL_H)
-endif()
+include (CheckTypeSize)
+include (CheckIncludeFile)
+CHECK_TYPE_SIZE("size_t"     SIZEOF_SIZE_T)
+CHECK_INCLUDE_FILE("stdbool.h" HAVE_STDBOOL_H)
 
 extend_qtc_library(
     karchive