diff --git a/include/common/standard.h b/include/common/standard.h
index b646ff7..aaed6be 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -1475,6 +1475,21 @@
 
 int parse_dotted_uints(const char *s, unsigned int **nums, size_t *sz);
 
+/* PRNG */
+void ha_random_seed(const unsigned char *seed, size_t len);
+void ha_random_jump96(uint32_t dist);
+uint64_t ha_random64();
+
+static inline uint32_t ha_random32()
+{
+	return ha_random64() >> 32;
+}
+
+static inline int32_t ha_random()
+{
+	return ha_random32() >> 1;
+}
+
 /* HAP_STRING() makes a string from a literal while HAP_XSTRING() first
  * evaluates the argument and is suited to pass macros.
  *