diff --git a/retropikzel/pffi/chibi.scm b/retropikzel/pffi/chibi.scm
index 9a015ed..e6bef02 100644
--- a/retropikzel/pffi/chibi.scm
+++ b/retropikzel/pffi/chibi.scm
@@ -165,8 +165,7 @@
 
 (define argument->pointer
   (lambda (value type)
-    (cond ((pffi-pointer? value) value)
-          ((procedure? value) (scheme-procedure-to-pointer value))
+    (cond ((procedure? value) (scheme-procedure-to-pointer value))
           (else (let ((pointer (pffi-pointer-allocate (size-of-type type))))
                   (pffi-pointer-set! pointer type 0 value)
                   pointer)))))
diff --git a/src/chibi/pffi.stub b/src/chibi/pffi.stub
index 69eb1ce..3196990 100644
--- a/src/chibi/pffi.stub
+++ b/src/chibi/pffi.stub
@@ -256,16 +256,7 @@
     ffi_prep_cif(&cif, FFI_DEFAULT_ABI, nargs, (ffi_type*)rtype, (ffi_type**)atypes);
     void* c_avalues[nargs];
     for(int i = 0; i < nargs; i++) {
-        if(atypes[i] == &ffi_type_pointer) {
-          if(sexp_booleanp(avalues[i])) {
-            void* p = NULL;
-            c_avalues[i] = &p;
-          } else {
-            c_avalues[i] = &sexp_cpointer_value(avalues[i]);
-          }
-        } else {
-          c_avalues[i] = sexp_cpointer_value(avalues[i]);
-        }
+      c_avalues[i] = sexp_cpointer_value(avalues[i]);
     }
     ffi_call(&cif, FFI_FN(fn), rvalue, c_avalues);
   }")