diff --git a/arch/ia64/kernel/acpi-processor.c b/arch/ia64/kernel/acpi-processor.c
index 4d4993a47e559fe6aa27c06f45182e8478338300..5a216c019924ff22fbce7da38aaebea97da7c732 100644
--- a/arch/ia64/kernel/acpi-processor.c
+++ b/arch/ia64/kernel/acpi-processor.c
@@ -44,7 +44,7 @@ static void init_intel_pdc(struct acpi_processor *pr)
 
 	buf[0] = ACPI_PDC_REVISION_ID;
 	buf[1] = 1;
-	buf[2] |= ACPI_PDC_EST_CAPABILITY_SMP;
+	buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
 
 	obj->type = ACPI_TYPE_BUFFER;
 	obj->buffer.length = 12;