diff --git a/src/basic/macro.h b/src/basic/macro.h
index 78679083e8..02d22de833 100644
--- a/src/basic/macro.h
+++ b/src/basic/macro.h
@@ -144,6 +144,14 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
                 !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
                 sizeof(x)/sizeof((x)[0]),                                \
                 (void)0))
+
+/*
+ * STRLEN - return the length of a string literal, minus the trailing NUL byte.
+ *          Contrary to strlen(), this is a constant expression.
+ * @x: a string literal.
+ */
+#define STRLEN(x) (sizeof(""x"") - 1)
+
 /*
  * container_of - cast a member of a structure out to the containing structure
  * @ptr: the pointer to the member.