diff --git a/compcert/lib/IEEE754_extra.v b/compcert/lib/IEEE754_extra.v
index cbb63075e..f7c2487b9 100644
--- a/compcert/lib/IEEE754_extra.v
+++ b/compcert/lib/IEEE754_extra.v
@@ -992,8 +992,6 @@ Remark bounded_Bexact_inverse:
   emin <= e <= emax - prec <-> bounded prec emax Bexact_inverse_mantissa e = true.
 Proof.
   intros. unfold bounded, canonical_mantissa. rewrite andb_true_iff.
-  rewrite ?Z.eqb_compare.
-  fold (Zeq_bool (fexp (Z.pos (digits2_pos Bexact_inverse_mantissa) + e)) e).
   rewrite <- Zeq_is_eq_bool. rewrite <- Zle_is_le_bool.
   rewrite Bexact_inverse_mantissa_digits2_pos.
   unfold fexp, FLT_exp, emin. lia.
diff --git a/progs/verif_union.v b/progs/verif_union.v
index 17395bb0b..e9af570bc 100644
--- a/progs/verif_union.v
+++ b/progs/verif_union.v
@@ -145,7 +145,6 @@ rewrite andb_true_iff in H.
 destruct H as [H H0].
 apply Z.leb_le in H0.
 unfold SpecFloat.canonical_mantissa in H.
-rewrite ?Z.eqb_compare in H.
 apply Zeq_bool_eq in H.
 unfold FLT.FLT_exp in H.
 rewrite Digits.Zpos_digits2_pos in H.
@@ -220,7 +219,6 @@ destruct e0 as [H' ?H].
 assert (-149 <= e). {
  clear - H'.
  unfold SpecFloat.canonical_mantissa in H'.
-rewrite ?Z.eqb_compare in H'.
 apply Zeq_bool_eq in H'.
 unfold FLT.FLT_exp in H'.
 rewrite Digits.Zpos_digits2_pos in H'.
diff --git a/progs64/verif_union.v b/progs64/verif_union.v
index ae8367ae8..cf371d09d 100644
--- a/progs64/verif_union.v
+++ b/progs64/verif_union.v
@@ -146,7 +146,6 @@ rewrite andb_true_iff in H.
 destruct H as [H H0].
 apply Z.leb_le in H0.
 unfold SpecFloat.canonical_mantissa in H.
-rewrite ?Z.eqb_compare in H.
 apply Zeq_bool_eq in H.
 unfold FLT.FLT_exp in H.
 rewrite Digits.Zpos_digits2_pos in H.
@@ -221,7 +220,6 @@ destruct e0 as [H' ?H].
 assert (-149 <= e). {
  clear - H'.
  unfold SpecFloat.canonical_mantissa in H'.
-rewrite ?Z.eqb_compare in H'.
 apply Zeq_bool_eq in H'.
 unfold FLT.FLT_exp in H'.
 rewrite Digits.Zpos_digits2_pos in H'.