diff --git a/core/include/blue/core/misc.h b/core/include/blue/core/misc.h
index 6484f3f..3e06ddf 100644
--- a/core/include/blue/core/misc.h
+++ b/core/include/blue/core/misc.h
@@ -8,6 +8,8 @@
 #define _Nonnull
 #endif
 
+#define B_NPOS            ((size_t)-1)
+
 #define b_min(type, x, y) (z__b_min_##type(x, y))
 #define b_max(type, x, y) (z__b_max_##type(x, y))