diff --git a/cmake/KDAB/modules/FindPySide2.cmake b/cmake/KDAB/modules/FindPySide2.cmake
index fcca1f2d..87c844f5 100644
--- a/cmake/KDAB/modules/FindPySide2.cmake
+++ b/cmake/KDAB/modules/FindPySide2.cmake
@@ -106,6 +106,8 @@ else()
         PYSIDE_INCLUDE_DIR pyside.h
         PATHS ${PYSIDE2_BASEDIR}/include ${PYSIDE_CUSTOM_PREFIX}/include/PySide2
         NO_DEFAULT_PATH
+        NO_CACHE
+        NO_SYSTEM_ENVIRONMENT_PATH
     )
 
     # Platform specific library names
diff --git a/cmake/KDAB/modules/FindShiboken2.cmake b/cmake/KDAB/modules/FindShiboken2.cmake
index f5664066..4bebbf83 100644
--- a/cmake/KDAB/modules/FindShiboken2.cmake
+++ b/cmake/KDAB/modules/FindShiboken2.cmake
@@ -94,6 +94,8 @@ else()
             SHIBOKEN_INCLUDE_DIR shiboken.h
             PATHS ${SHIBOKEN_CUSTOM_PREFIX} ${SHIBOKEN_GENERATOR_BASEDIR}/include
             NO_DEFAULT_PATH
+            NO_CACHE
+            NO_SYSTEM_ENVIRONMENT_PATH
         )
         if(MSVC)
             set(SHIBOKEN_LIBRARY_BASENAMES "shiboken2.abi3.lib")