diff --git a/library/ecdsa.c b/library/ecdsa.c
index 2072d55..4bfdc7d 100644
--- a/library/ecdsa.c
+++ b/library/ecdsa.c
@@ -349,7 +349,8 @@
  */
 int ecdsa_self_test( int verbose )
 {
-    return( verbose++ );
+    ((void) verbose );
+    return( 0 );
 }
 
 #endif