2 files changed, 4 insertions, 2 deletions
diff --git a/kern/mutex/mutex_adaptive.c b/kern/mutex/mutex_adaptive.c
index 68b006ad..8da55270 100644
--- a/kern/mutex/mutex_adaptive.c
+++ b/kern/mutex/mutex_adaptive.c
@@ -24,6 +24,7 @@
 #include <kern/clock.h>
 #include <kern/error.h>
 #include <kern/init.h>
+#include <kern/macros.h>
 #include <kern/mutex.h>
 #include <kern/mutex_types.h>
 #include <kern/sleepq.h>
@@ -235,7 +236,7 @@ out:
 void
 mutex_adaptive_lock_slow(struct mutex *mutex)
 {
-    int error;
+    __unused int error;
 
     error = mutex_adaptive_lock_slow_common(mutex, false, 0);
     assert(!error);
diff --git a/kern/mutex/mutex_plain.c b/kern/mutex/mutex_plain.c
index 2c655940..abfa3396 100644
--- a/kern/mutex/mutex_plain.c
+++ b/kern/mutex/mutex_plain.c
@@ -22,6 +22,7 @@
 
 #include <kern/atomic.h>
 #include <kern/init.h>
+#include <kern/macros.h>
 #include <kern/mutex.h>
 #include <kern/mutex_types.h>
 #include <kern/sleepq.h>
@@ -133,7 +134,7 @@ out:
 void
 mutex_plain_lock_slow(struct mutex *mutex)
 {
-    int error;
+    __unused int error;
 
     error = mutex_plain_lock_slow_common(mutex, false, 0);
     assert(!error);