1 files changed, 1 insertions, 1 deletions
diff --git a/spinlock.h b/spinlock.h
index 0a9d8e2..90bffdb 100644
--- a/spinlock.h
+++ b/spinlock.h
@@ -5,7 +5,7 @@ struct spinlock {
   // For debugging:
   char *name;        // Name of lock.
   struct cpu *cpu;   // The cpu holding the lock.
-  uint pcs[10];      // The call stack (an array of program counters)
+  uint64 pcs[10];      // The call stack (an array of program counters)
                      // that locked the lock.
 };