diff --git a/src/test/run-make-fulldeps/core-no-fp-fmt-parse/Makefile b/src/test/run-make-fulldeps/core-no-fp-fmt-parse/Makefile
index d083aaa662005..ec05ebea55582 100644
--- a/src/test/run-make-fulldeps/core-no-fp-fmt-parse/Makefile
+++ b/src/test/run-make-fulldeps/core-no-fp-fmt-parse/Makefile
@@ -1,4 +1,4 @@
 include ../tools.mk
 
 all:
-	$(RUSTC) --edition=2021 --crate-type=rlib ../../../../library/core/src/lib.rs --cfg no_fp_fmt_parse
+	$(RUSTC) --edition=2021 -Dwarnings --crate-type=rlib ../../../../library/core/src/lib.rs --cfg no_fp_fmt_parse