diff --git a/programs/pkey/key_app.c b/programs/pkey/key_app.c
index 051ceb5..2f906c4 100644
--- a/programs/pkey/key_app.c
+++ b/programs/pkey/key_app.c
@@ -169,7 +169,7 @@
         if( ret != 0 )
         {
 #ifdef POLARSSL_ERROR_C
-            error_strerror( ret, buf, 1024 );
+            polarssl_strerror( ret, buf, 1024 );
 #endif
             printf( " failed\n  !  x509parse_key returned %d - %s\n\n", ret, buf );
             rsa_free( &rsa );
@@ -204,7 +204,7 @@
         if( ret != 0 )
         {
 #ifdef POLARSSL_ERROR_C
-            error_strerror( ret, buf, 1024 );
+            polarssl_strerror( ret, buf, 1024 );
 #endif
             printf( " failed\n  !  x509parse_public_key returned %d - %s\n\n", ret, buf );
             rsa_free( &rsa );