diff --git a/src/libsodium/crypto_pwhash/crypto_pwhash.c b/src/libsodium/crypto_pwhash/crypto_pwhash.c
index b9c87f19..b65b7209 100644
--- a/src/libsodium/crypto_pwhash/crypto_pwhash.c
+++ b/src/libsodium/crypto_pwhash/crypto_pwhash.c
@@ -83,3 +83,8 @@ crypto_pwhash_str_verify(const char str[crypto_pwhash_STRBYTES],
 {
     return crypto_pwhash_argon2i_str_verify(str, passwd, passwdlen);
 }
+
+const char *
+crypto_pwhash_primitive(void) {
+    return crypto_pwhash_PRIMITIVE;
+}
diff --git a/src/libsodium/include/sodium/crypto_pwhash.h b/src/libsodium/include/sodium/crypto_pwhash.h
index 75e0249f..78d01928 100644
--- a/src/libsodium/include/sodium/crypto_pwhash.h
+++ b/src/libsodium/include/sodium/crypto_pwhash.h
@@ -71,6 +71,11 @@ int crypto_pwhash_str_verify(const char str[crypto_pwhash_STRBYTES],
                              unsigned long long passwdlen)
             __attribute__ ((warn_unused_result));
 
+#define crypto_pwhash_PRIMITIVE "argon2i"
+SODIUM_EXPORT
+const char *crypto_pwhash_primitive(void)
+            __attribute__ ((warn_unused_result));
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/test/default/pwhash.c b/test/default/pwhash.c
index c3d97a4b..41eb1e69 100644
--- a/test/default/pwhash.c
+++ b/test/default/pwhash.c
@@ -242,6 +242,7 @@ int main(void)
     assert(crypto_pwhash_memlimit_moderate() > 0U);
     assert(crypto_pwhash_opslimit_sensitive() > 0U);
     assert(crypto_pwhash_memlimit_sensitive() > 0U);
+    assert(strcmp(crypto_pwhash_primitive(), "argon2i") == 0);
 
     sodium_free(salt);
     sodium_free(str_out);