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diff --git a/matita/matita/contribs/lambda_delta/basic_2/reducibility/cpr_cpr.ma b/matita/matita/contribs/lambda_delta/basic_2/reducibility/cpr_cpr.ma
index 583726cd4..87eaa161f 100644
--- a/matita/matita/contribs/lambda_delta/basic_2/reducibility/cpr_cpr.ma
+++ b/matita/matita/contribs/lambda_delta/basic_2/reducibility/cpr_cpr.ma
@@ -31,7 +31,7 @@ lemma cpr_bind_dx: ∀I,L,V1,V2,T1,T2. V1 ➡ V2 → L. ⓑ{I} V2 ⊢ T1 ➡ T2
 #I #L #V1 #V2 #T1 #T2 #HV12 * #T #HT1 normalize #HT2
 elim (tpss_split_up … HT2 1 ? ?) -HT2 // #T0 <minus_n_O #HT0 normalize <minus_plus_m_m #HT02
 lapply (tpss_lsubs_trans … HT0 (⋆. ⓑ{I} V2) ?) -HT0 /2 width=1/ #HT0
-lapply (tpss_tps … HT0) -HT0 #HT0
+lapply (tpss_inv_SO2 … HT0) -HT0 #HT0
 @ex2_1_intro [2: @(tpr_delta … HV12 HT1 HT0) | skip | /2 width=1/ ] (**) (* /3 width=5/ is too slow *)
 qed.