diff --git a/tests/unittests/Makefile b/tests/unittests/Makefile
index 1a28971b70..9b13107b09 100644
--- a/tests/unittests/Makefile
+++ b/tests/unittests/Makefile
@@ -246,10 +246,6 @@ ifneq (,$(filter tests-cpp_%, $(UNIT_TESTS)))
   export CPPMIX := 1
 endif
 
-ifneq (,$(filter $(LARGE_STACK_TESTS), $(UNIT_TESTS)))
-  CFLAGS += -DTHREAD_STACKSIZE_MAIN=\(4*THREAD_STACKSIZE_DEFAULT+THREAD_EXTRA_STACKSIZE_PRINTF\)
-endif
-
 DISABLE_MODULE += auto_init
 
 # Pull in `Makefile.include`s from the test suites: