diff --git a/cmake/QtModuleHelpers.cmake b/cmake/QtModuleHelpers.cmake
index 634c4a4c33..47a02b1a00 100644
--- a/cmake/QtModuleHelpers.cmake
+++ b/cmake/QtModuleHelpers.cmake
@@ -129,6 +129,10 @@ function(qt_internal_add_module target)
 
     qt_internal_module_info(module "${target}")
     qt_internal_add_qt_repo_known_module("${target}")
+    if(arg_INTERNAL_MODULE)
+        set_target_properties(${target} PROPERTIES _qt_is_internal_module TRUE)
+        set_property(TARGET ${target} APPEND PROPERTY EXPORT_PROPERTIES _qt_is_internal_module)
+    endif()
 
     if(NOT arg_CONFIG_MODULE_NAME)
         set(arg_CONFIG_MODULE_NAME "${module_lower}")
diff --git a/cmake/QtTargetHelpers.cmake b/cmake/QtTargetHelpers.cmake
index f497d55924..cc7481aec1 100644
--- a/cmake/QtTargetHelpers.cmake
+++ b/cmake/QtTargetHelpers.cmake
@@ -101,6 +101,12 @@ function(qt_internal_extend_target target)
         endforeach()
 
         set(target_private "${target}Private")
+        get_target_property(is_internal_module ${target} _qt_is_internal_module)
+        # Internal modules don't have Private targets but we still need to
+        # propagate their private dependencies.
+        if(is_internal_module)
+            set(target_private "${target}")
+        endif()
         if(TARGET "${target_private}")
           target_link_libraries("${target_private}"
                                 INTERFACE ${arg_PRIVATE_MODULE_INTERFACE})