diff --git a/foreign/c/primitives/ypsilon.scm b/foreign/c/primitives/ypsilon.scm
index 46c4401..8e21fa0 100644
--- a/foreign/c/primitives/ypsilon.scm
+++ b/foreign/c/primitives/ypsilon.scm
@@ -19,7 +19,6 @@
           ((eq? type 'float) (c-sizeof float))
           ((eq? type 'double) (c-sizeof double))
           ((eq? type 'pointer) (c-sizeof void*))
-          ((eq? type 'struct) (c-sizeof void*))
           ((eq? type 'callback) (c-sizeof void*))
           ((eq? type 'void) 0)
           (else #f))))
@@ -45,7 +44,6 @@
           ((eq? type 'float) (alignof:float))
           ((eq? type 'double) (alignof:double))
           ((eq? type 'pointer) (alignof:void*))
-          ((eq? type 'struct) (alignof:void*))
           ((eq? type 'callback) (alignof:void*))
           ((eq? type 'void) 0)
           (else #f))))