diff --git a/gcc/config/mips/ultrix.h b/gcc/config/mips/ultrix.h
index b7dbcd5b71b..45e7707ff11 100644
--- a/gcc/config/mips/ultrix.h
+++ b/gcc/config/mips/ultrix.h
@@ -66,7 +66,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #endif
 
 /* For compatibility with types.h.  */
-#ifndef STARTFILE_SPEC
+#ifndef SIZE_TYPE
 #define SIZE_TYPE "unsigned int"
 #endif