diff --git a/sys/Makefile.dep b/sys/Makefile.dep
index 9357015900..dad7ead251 100644
--- a/sys/Makefile.dep
+++ b/sys/Makefile.dep
@@ -405,12 +405,6 @@ ifneq (,$(filter entropy_source_%,$(USEMODULE)))
   USEMODULE += entropy_source
 endif
 
-ifneq (,$(filter puf_sram,$(USEMODULE)))
-  USEMODULE += hashes
-  USEMODULE += random
-  FEATURES_REQUIRED += puf_sram
-endif
-
 ifneq (,$(filter random,$(USEMODULE)))
   DEFAULT_MODULE += auto_init_random
   USEMODULE += prng
diff --git a/sys/puf_sram/Makefile.dep b/sys/puf_sram/Makefile.dep
new file mode 100644
index 0000000000..081fbf0c31
--- /dev/null
+++ b/sys/puf_sram/Makefile.dep
@@ -0,0 +1,3 @@
+USEMODULE += hashes
+USEMODULE += random
+FEATURES_REQUIRED += puf_sram