diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index 270500db317..fa6381ae831 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,7 @@
+2001-08-10  Loren J. Rittle  <ljrittle@acm.org>
+
+	* java/lang/natObject.cc (is_mp): Protect use of _SC_NPROCESSORS_ONLN.
+
 2001-08-06  Tom Tromey  <tromey@redhat.com>
 
 	* java/io/InputStreamReader.java (refill): Only call refill on
diff --git a/libjava/java/lang/natObject.cc b/libjava/java/lang/natObject.cc
index adb487a0dc2..0404d2d51cb 100644
--- a/libjava/java/lang/natObject.cc
+++ b/libjava/java/lang/natObject.cc
@@ -436,8 +436,12 @@ typedef size_t obj_addr_t;	/* Integer type big enough for object	*/
 static bool
 is_mp()
 {
+#ifdef _SC_NPROCESSORS_ONLN
   long nprocs = sysconf(_SC_NPROCESSORS_ONLN);
   return (nprocs > 1);
+#else
+  return false;
+#endif
 }
 
 // A call to keep_live(p) forces p to be accessible to the GC