diff --git a/include/obstack.h b/include/obstack.h
index a6eb6c95587ee4223ea530f966ce0bbc3b8ddaf6..0d8746f835b1f14401d725fd5c3362af5c46488d 100644
--- a/include/obstack.h
+++ b/include/obstack.h
@@ -137,9 +137,9 @@
    relative to B.  Otherwise, use the faster strategy of computing the
    alignment relative to 0.  */
 
-#define __PTR_ALIGN(B, P, A)						      \
-  __BPTR_ALIGN (sizeof (ptrdiff_t) < sizeof (void *) ? (B) : (char *) 0,      \
-                P, A)
+#define __PTR_ALIGN(B, P, A)						\
+  (sizeof (ptrdiff_t) < sizeof (void *) ? __BPTR_ALIGN (B, P, A)	\
+   : (char *) (((ptrdiff_t) (P) + (A)) & ~(A)))
 
 #ifndef __attribute_pure__
 # if defined __GNUC_MINOR__ && __GNUC__ * 1000 + __GNUC_MINOR__ >= 2096