diff --git a/pkg/tinydtls/Makefile.dep b/pkg/tinydtls/Makefile.dep
index f76edd6d15..36392f3ba6 100644
--- a/pkg/tinydtls/Makefile.dep
+++ b/pkg/tinydtls/Makefile.dep
@@ -8,3 +8,6 @@ ifneq (,$(filter tinydtls,$(USEMODULE)))
   USEMODULE += tinydtls_aes
   USEMODULE += tinydtls_ecc
 endif
+
+# TinyDTLS only has support for 32-bit architectures ATM
+FEATURES_REQUIRED += arch_32bit