diff --git a/src/librepgp/stream-key.cpp b/src/librepgp/stream-key.cpp
index a3ca026a9e..89b842e66a 100644
--- a/src/librepgp/stream-key.cpp
+++ b/src/librepgp/stream-key.cpp
@@ -1175,6 +1175,7 @@ pgp_key_pkt_t::~pgp_key_pkt_t()
     free(sec_data);
 }
 
+#if defined(ENABLE_CRYPTO_REFRESH)
 uint8_t
 pgp_key_pkt_t::s2k_specifier_len(pgp_s2k_specifier_t specifier)
 {
@@ -1190,6 +1191,7 @@ pgp_key_pkt_t::s2k_specifier_len(pgp_s2k_specifier_t specifier)
         throw rnp::rnp_exception(RNP_ERROR_BAD_PARAMETERS);
     }
 }
+#endif
 
 void
 pgp_key_pkt_t::make_s2k_params(pgp_packet_body_t &hbody)
diff --git a/src/librepgp/stream-key.h b/src/librepgp/stream-key.h
index 7474a749ba..ecee586ef4 100644
--- a/src/librepgp/stream-key.h
+++ b/src/librepgp/stream-key.h
@@ -74,9 +74,11 @@ typedef struct pgp_key_pkt_t {
 
   private:
     /* create the contents of the algorithm specific public key fields in a separate packet */
-    void    make_alg_spec_fields_for_public_key(pgp_packet_body_t &hbody);
-    void    make_s2k_params(pgp_packet_body_t &hbody);
+    void make_alg_spec_fields_for_public_key(pgp_packet_body_t &hbody);
+    void make_s2k_params(pgp_packet_body_t &hbody);
+#if defined(ENABLE_CRYPTO_REFRESH)
     uint8_t s2k_specifier_len(pgp_s2k_specifier_t specifier);
+#endif
 } pgp_key_pkt_t;
 
 /* userid/userattr with all the corresponding signatures */