diff --git a/include/bfdev/bug.h b/include/bfdev/bug.h
index c532d09c..cd0a4cc4 100644
--- a/include/bfdev/bug.h
+++ b/include/bfdev/bug.h
@@ -43,7 +43,7 @@ BFDEV_WARN_MSG(                                         \
 
 #ifndef BFDEV_BUG_ON
 # define BFDEV_BUG_ON(condition) ({     \
-    bfdev_bool __cond = !!(condition);        \
+    bfdev_bool __cond = !!(condition);  \
     if (bfdev_unlikely(__cond))         \
         BFDEV_BUG();                    \
     bfdev_unlikely(__cond);             \
@@ -52,7 +52,7 @@ BFDEV_WARN_MSG(                                         \
 
 #ifndef BFDEV_WARN_ON
 # define BFDEV_WARN_ON(condition) ({    \
-    bfdev_bool __cond = !!(condition);        \
+    bfdev_bool __cond = !!(condition);  \
     if (bfdev_unlikely(__cond))         \
         BFDEV_WARN();                   \
     bfdev_unlikely(__cond);             \
diff --git a/include/bfdev/types.h b/include/bfdev/types.h
index 85b87c58..e13fdf52 100644
--- a/include/bfdev/types.h
+++ b/include/bfdev/types.h
@@ -52,6 +52,9 @@ typedef int bfdev_state_t;
 typedef bfdev_intptr_t bfdev_atomic_t;
 typedef bfdev_u64 bfdev_time_t;
 
+#define BFDEV_OK 0
+#define BFDEV_ERROR -1
+
 #define BFDEV_EQ 0
 #define BFDEV_BT 1
 #define BFDEV_LT -1