diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 6689894..33d4678 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -3751,7 +3751,7 @@
     key_cert->cert = own_cert;
     key_cert->key  = pk_key;
 
-    return( 0 );
+    return( pk_check_pair( &key_cert->cert->pk, key_cert->key ) );
 }
 
 #if defined(POLARSSL_RSA_C)
@@ -3780,7 +3780,7 @@
     key_cert->cert = own_cert;
     key_cert->key_own_alloc = 1;
 
-    return( 0 );
+    return( pk_check_pair( &key_cert->cert->pk, key_cert->key ) );
 }
 #endif /* POLARSSL_RSA_C */
 
@@ -3809,7 +3809,7 @@
     key_cert->cert = own_cert;
     key_cert->key_own_alloc = 1;
 
-    return( 0 );
+    return( pk_check_pair( &key_cert->cert->pk, key_cert->key ) );
 }
 #endif /* POLARSSL_X509_CRT_PARSE_C */