diff --git a/cmake/QtDocsHelpers.cmake b/cmake/QtDocsHelpers.cmake
index 3ce7b3846c4..155c8ba763d 100644
--- a/cmake/QtDocsHelpers.cmake
+++ b/cmake/QtDocsHelpers.cmake
@@ -117,7 +117,9 @@ function(qt_internal_add_docs)
         )
     endif()
 
-    if(QT_SUPERBUILD OR "${PROJECT_NAME}" STREQUAL "QtBase")
+    if(DEFINED ENV{QT_INSTALL_DOCS})
+        set(qt_install_docs_env "$ENV{QT_INSTALL_DOCS}")
+    elseif(QT_SUPERBUILD OR "${PROJECT_NAME}" STREQUAL "QtBase")
         set(qt_install_docs_env "${QtBase_BINARY_DIR}/${INSTALL_DOCDIR}")
     else()
         set(qt_install_docs_env "${QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX}/${INSTALL_DOCDIR}")