diff --git a/direct/src/ffi/FFIConstants.py b/direct/src/ffi/FFIConstants.py
index e5fb7f010f..1ace18472e 100644
--- a/direct/src/ffi/FFIConstants.py
+++ b/direct/src/ffi/FFIConstants.py
@@ -21,4 +21,4 @@ InterrogateModuleName = None
 wantComments = 1
 
 # Should FFI output type assertions?
-wantTypeChecking = 0
+wantTypeChecking = 1