diff --git a/gdb/tm-sun386.h b/gdb/tm-sun386.h
index 60c8986bb3..719f52c01d 100644
--- a/gdb/tm-sun386.h
+++ b/gdb/tm-sun386.h
@@ -22,6 +22,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #ifndef sun386
 #define sun386
 #endif
+#define GDB_TARGET_IS_SUN386 1
 #define SUNOS4
 #define USE_MACHINE_REG_H
 
@@ -34,8 +35,6 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #define _EXEC_
 #endif
 
-#define BROKEN_LARGE_ALLOCA
-
 /* sun386 ptrace seems unable to change the frame pointer */
 #define PTRACE_FP_BUG
 
diff --git a/gdb/xm-sun386.h b/gdb/xm-sun386.h
index 69b367324a..730ac8ad22 100644
--- a/gdb/xm-sun386.h
+++ b/gdb/xm-sun386.h
@@ -23,6 +23,8 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #define SET_STACK_LIMIT_HUGE
 
+#define BROKEN_LARGE_ALLOCA
+
 /* Enable use of alternate code for Sun's format of core dump file.  */
 
 #define NEW_SUN_CORE