diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7cee31cd5de..8bb0b0898a6 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Sat Feb 20 09:08:44 1999  Richard Earnshaw  (rearnsha@arm.com)
+
+	* xm-arm.h (HOST_BITS_PER_LONGLONG): Define.
+
 Fri Feb 19 23:02:02 1999  Richard Henderson  <rth@cygnus.com>
 
 	* regmove.c (discover_flags_reg): New function.
diff --git a/gcc/config/arm/xm-arm.h b/gcc/config/arm/xm-arm.h
index a6143fa9abf..0899e9f74e5 100644
--- a/gcc/config/arm/xm-arm.h
+++ b/gcc/config/arm/xm-arm.h
@@ -30,6 +30,7 @@ Boston, MA 02111-1307, USA.  */
 #define HOST_BITS_PER_SHORT 16
 #define HOST_BITS_PER_INT 32
 #define HOST_BITS_PER_LONG 32
+#define HOST_BITS_PER_LONGLONG 64
 
 /* A code distinguishing the floating point format of the host
    machine.  There are three defined values: IEEE_FLOAT_FORMAT,