diff --git a/cmake/QtTargetHelpers.cmake b/cmake/QtTargetHelpers.cmake
index b94a4bdae2b..bc4f1125600 100644
--- a/cmake/QtTargetHelpers.cmake
+++ b/cmake/QtTargetHelpers.cmake
@@ -51,9 +51,18 @@ function(qt_internal_extend_target target)
         endforeach()
 
         # Set-up the target
-        target_sources("${target}" PRIVATE ${arg_SOURCES} ${dbus_sources})
-        if (arg_COMPILE_FLAGS)
-            set_source_files_properties(${arg_SOURCES} PROPERTIES COMPILE_FLAGS "${arg_COMPILE_FLAGS}")
+
+        # CMake versions less than 3.19 don't support adding the source files to the PRIVATE scope
+        # of the INTERFACE libraries. These PRIVATE sources are only needed by IDEs to display
+        # them in a project tree, so to avoid build issues and appearing the sources in
+        # INTERFACE_SOURCES property of HEADER_MODULE let's simply exclude them for compatibility
+        # with CMake versions less than 3.19.
+        if(NOT arg_HEADER_MODULE OR CMAKE_VERSION VERSION_GREATER_EQUAL "3.19")
+            target_sources("${target}" PRIVATE ${arg_SOURCES} ${dbus_sources})
+            if (arg_COMPILE_FLAGS)
+                set_source_files_properties(${arg_SOURCES} PROPERTIES
+                    COMPILE_FLAGS "${arg_COMPILE_FLAGS}")
+            endif()
         endif()
 
         set(public_visibility_option "PUBLIC")