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diff --git a/VEX/priv/guest_s390_defs.h b/VEX/priv/guest_s390_defs.h
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index b9f038aaa..9f93cff19 100644
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--- a/VEX/priv/guest_s390_defs.h
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+++ b/VEX/priv/guest_s390_defs.h
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@@ -261,7 +261,7 @@ extern ULong last_execute_target;
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 /* Vector operatons passed to s390x_dirtyhelper_vec_op(...) helper.
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    Please don't change ordering of elements and append new items
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    before  S390_VEC_OP_LAST. */
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-enum {
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+typedef enum {
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    S390_VEC_OP_INVALID = 0,
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    S390_VEC_OP_VPKS = 1,
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    S390_VEC_OP_VPKLS = 2,