diff --git a/gcc/config/rs6000/xm-rs6000.h b/gcc/config/rs6000/xm-rs6000.h
index a2671675f09..46765f52bc9 100644
--- a/gcc/config/rs6000/xm-rs6000.h
+++ b/gcc/config/rs6000/xm-rs6000.h
@@ -55,3 +55,6 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 
 #define	USG
+
+/* This is the only version of nm that collect2 can work with.  */
+#define REAL_NM_FILE_NAME "/usr/ucb/nm"