diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 72c580d94e2448b6f2a2e6a434c4cef6b90f3395..f7a841573b84b4fe04f335ee1dc81795e96805e2 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -612,7 +612,7 @@ static inline void cpu_probe_sibyte(struct cpuinfo_mips *c)
 	 * cache code which eventually will be folded into c-r4k.c.  Until
 	 * then we pretend it's got it's own cache architecture.
 	 */
-	c->options &= MIPS_CPU_4K_CACHE;
+	c->options &= ~MIPS_CPU_4K_CACHE;
 	c->options |= MIPS_CPU_SB1_CACHE;
 
 	switch (c->processor_id & 0xff00) {