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-rw-r--r--bin/expr/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/bin/expr/Makefile b/bin/expr/Makefile
index a1f6cbf21091..1d741b7e0b6d 100644
--- a/bin/expr/Makefile
+++ b/bin/expr/Makefile
@@ -6,6 +6,9 @@ PROG= expr
SRCS= expr.y
YFLAGS=
+# expr relies on signed integer wrapping
+CFLAGS+= -fwrapv
+
NO_WMISSING_VARIABLE_DECLARATIONS=
.if ${MK_TESTS} != "no"