diff --git a/common/util.h b/common/util.h
index eeb5a4d08..ac621eb26 100644
--- a/common/util.h
+++ b/common/util.h
@@ -177,6 +177,17 @@ static inline int a_strcmp(const char *a, const char *b)
         return strcmp(NONULL(a), NONULL(b));
 }
 
+/** \brief \c NULL resistant strcasecmp.
+ * \param[in]  a     the first string.
+ * \param[in]  b     the second string.
+ * \return <tt>strcasecmp(a, b)</tt>, and treats \c NULL strings like \c ""
+ * ones.
+ */
+static inline int a_strcasecmp(const char *a, const char *b)
+{
+    return strcasecmp(NONULL(a), NONULL(b));
+}
+
 /** \brief \c NULL resistant strncmp.
  * \param[in]  a     the first string.
  * \param[in]  b     the second string.