diff --git a/src/s/freebsd.h b/src/s/freebsd.h
index e0bde6f1d24..a405113a4bb 100644
--- a/src/s/freebsd.h
+++ b/src/s/freebsd.h
@@ -188,7 +188,7 @@
 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method for marking the
    stack.  */
 
-#define GC_MARK_STACK 	1
+#define GC_MARK_STACK 	GC_MAKE_GCPROS_NOOPS
 
 /* Define USE_MMAP_FOR_BUFFERS to let Emacs use mmap(2) to allocate
    buffer text.  This overrides REL_ALLOC.  */
diff --git a/src/s/netbsd.h b/src/s/netbsd.h
index b5cd081b418..b101ca456de 100644
--- a/src/s/netbsd.h
+++ b/src/s/netbsd.h
@@ -112,5 +112,5 @@
  
 /* Use the GC_MAKE_GCPROS_NOOPS (see lisp.h) method.  */
 
-#define GC_MARK_STACK	1
+#define GC_MARK_STACK	GC_MAKE_GCPROS_NOOPS