diff --git a/sys/Makefile.dep b/sys/Makefile.dep
index aba226dbe2..9357015900 100644
--- a/sys/Makefile.dep
+++ b/sys/Makefile.dep
@@ -403,9 +403,6 @@ endif
 
 ifneq (,$(filter entropy_source_%,$(USEMODULE)))
   USEMODULE += entropy_source
-  ifneq (,$(filter entropy_source_adc_noise,$(USEMODULE)))
-    FEATURES_REQUIRED += periph_adc
-  endif
 endif
 
 ifneq (,$(filter puf_sram,$(USEMODULE)))
diff --git a/sys/entropy_source/Makefile.dep b/sys/entropy_source/Makefile.dep
new file mode 100644
index 0000000000..72852bdb11
--- /dev/null
+++ b/sys/entropy_source/Makefile.dep
@@ -0,0 +1,3 @@
+ifneq (,$(filter entropy_source_adc_noise,$(USEMODULE)))
+  FEATURES_REQUIRED += periph_adc
+endif