diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7836fbe0fea..5ec82b69d3d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+1999-11-28  Andreas Jaeger  <aj@suse.de>
+
+	* mips/linux.h (CPP_PREDEFINES): Undefine before redefining.
+
 Sun Nov 28 00:48:15 1999  Philippe De Muyter  <phdm@macqel.be>
 
 	* cccp.c (do_include): Avoid initialization of automatic variable.
diff --git a/gcc/config/mips/linux.h b/gcc/config/mips/linux.h
index 455df16b43f..9641c02dcad 100644
--- a/gcc/config/mips/linux.h
+++ b/gcc/config/mips/linux.h
@@ -41,6 +41,7 @@ Boston, MA 02111-1307, USA.  */
 #define DEFAULT_VTABLE_THUNKS 1
 
 /* Specify predefined symbols in preprocessor.  */
+#undef CPP_PREDEFINES
 #if TARGET_ENDIAN_DEFAULT == 0
 #define CPP_PREDEFINES "-DMIPSEL -D_MIPSEL -Dunix -Dmips -D_mips \
 -DR3000 -D_R3000 -Dlinux -Asystem(posix) -Acpu(mips) \