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-rw-r--r--stdlib/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index e0fc82fc4d..83391d00c1 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -392,7 +392,7 @@ CFLAGS-tst-qsort.c += $(stack-align-test-flags)
CFLAGS-tst-makecontext.c += -funwind-tables
CFLAGS-tst-makecontext2.c += $(stack-align-test-flags)
-CFLAGS-testmb.c += -D_FORTIFY_SOURCE=2 -Wall -Werror
+CFLAGS-testmb.c += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Wall -Werror
# Run a test on the header files we use.