diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
index 55cf4c0..4749f37 100644
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -319,7 +319,7 @@
 		goto fail;
 
 	for (i = 0; i < num_counters; ++i) {
-		char buffer[10];
+		char buffer[12];
 		char *name;
 
 		if (i < num_gpes)