diff --git a/sys/Makefile.dep b/sys/Makefile.dep
index e96a15b89b..0f738e5ffe 100644
--- a/sys/Makefile.dep
+++ b/sys/Makefile.dep
@@ -922,9 +922,12 @@ endif
 ifneq (,$(filter suit,$(USEMODULE)))
   USEPKG += nanocbor
   USEPKG += libcose
-  USEMODULE += libcose_crypt_c25519
   USEMODULE += uuid
 
+  ifeq (,$(filter libcose_crypt_%,$(USEMODULE)))
+    USEMODULE += libcose_crypt_c25519
+  endif
+
   # tests/suit_manifest has some mock implementations,
   # only add the non-mock dependencies if not building that test.
   ifeq (,$(filter suit_transport_mock,$(USEMODULE)))