diff --git a/gas/ChangeLog b/gas/ChangeLog
index da68f958ce..9ad0f91e31 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2001-10-24  Chris Demetriou  <cgd@broadcom.com>
+
+	* config/tc-mips.c (hilo_interlocks, cop_interlocks): Make
+	these evaluate to true if mips_arch indicates SB-1.
+
 2001-10-23  Alan Modra  <amodra@bigpond.net.au>
 
 	* as.c (parse_args): Print the date as well for --version.
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index 847ee2c839..96f13a00c5 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -258,6 +258,7 @@ static int mips_fp32 = 0;
    require nops to be inserted.  */
 
 #define hilo_interlocks (mips_arch == CPU_R4010                       \
+                         || mips_arch == CPU_SB1                      \
                          )
 
 /* Whether the processor uses hardware interlocks to protect reads
@@ -270,6 +271,7 @@ static int mips_fp32 = 0;
    (co-processor) interlocks.  */
 /* Itbl support may require additional care here.  */
 #define cop_interlocks (mips_arch == CPU_R4300                        \
+                        || mips_arch == CPU_SB1                       \
 			)
 
 /* Is this a mfhi or mflo instruction?  */