diff --git a/tests/ssp/Makefile b/tests/ssp/Makefile
index eb11ad1871..2dacca7f28 100644
--- a/tests/ssp/Makefile
+++ b/tests/ssp/Makefile
@@ -5,6 +5,7 @@ USEMODULE += ssp
 # This test intentionally crashes the firmware and when using a board with a
 # preflashed bootloader, it cannot be reflashed automatically afterwards.
 FEATURES_BLACKLIST += bootloader_arduino
+FEATURES_BLACKLIST += bootloader_nrfutil
 
 include $(RIOTBASE)/Makefile.include
 
diff --git a/tests/unittests/Makefile b/tests/unittests/Makefile
index 848c2fbc36..f2f70dcad3 100644
--- a/tests/unittests/Makefile
+++ b/tests/unittests/Makefile
@@ -13,11 +13,12 @@ endif
 
 DISABLE_MODULE += auto_init auto_init_%
 
-# boards using arduino bootloader require auto_init to
+# boards using a preflashed bootloader require auto_init to
 # automatically initialize stdio over USB. Without this, the bootloader
 # management feature cannot be used (auto reset and auto reboot in bootloader
 # mode)
 FEATURES_BLACKLIST += bootloader_arduino
+FEATURES_BLACKLIST += bootloader_nrfutil
 
 # Pull in `Makefile.include`s from the test suites:
 -include $(UNIT_TESTS:%=$(RIOTBASE)/tests/unittests/%/Makefile.include)