diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8d59283fc1..dc9b794b9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -413,7 +413,7 @@ endif()
 if( KICAD_USE_OCC )
     add_definitions( -DKICAD_USE_OCC )
     remove_definitions( -DKICAD_USE_OCE )
-    unset( KICAD_USE_OCE )
+    unset( KICAD_USE_OCE CACHE )
 endif()
 
 if( KICAD_USE_CUSTOM_PADS )