diff --git a/qmake/CMakeLists.txt b/qmake/CMakeLists.txt
index d3e8f56a54b..56ea3b3fd6a 100644
--- a/qmake/CMakeLists.txt
+++ b/qmake/CMakeLists.txt
@@ -58,7 +58,6 @@ qt_internal_add_tool(${target_name}
     TRY_RUN
     TOOLS_TARGET Core
     USER_FACING
-    NO_UNITY_BUILD
     INSTALL_VERSIONED_LINK
     SOURCES
         cachekeys.h
@@ -99,6 +98,9 @@ qt_internal_add_tool(${target_name}
         "qmake_pch.h"
     LIBRARIES
         QtLibraryInfo
+    NO_UNITY_BUILD_SOURCES
+        generators/win32/msvc_objectmodel.cpp # xml symbols clash with generators/win32/msbuild_objectmodel.cpp
+        library/qmakeparser.cpp               # struct statics clashes with qmakeevaluator_p.h
 )
 qt_internal_return_unless_building_tools()