diff --git a/tests/pthread_flood/Makefile b/tests/pthread_flood/Makefile
index 1ae50c35b1..5e567c7046 100644
--- a/tests/pthread_flood/Makefile
+++ b/tests/pthread_flood/Makefile
@@ -4,4 +4,7 @@ USEMODULE += posix_headers
 USEMODULE += pthread
 CFLAGS += -DMAXTHREADS=8
 
+# include "fmt" so print_stack_usage needs less stack
+USEMODULE += fmt
+
 include $(RIOTBASE)/Makefile.include