diff --git a/library/pk.c b/library/pk.c
index 464243e..5a83855 100644
--- a/library/pk.c
+++ b/library/pk.c
@@ -332,7 +332,7 @@
     if( ctx == NULL || ctx->pk_info == NULL )
         return( 0 );
 
-    return( ctx->pk_info->get_size( ctx->pk_ctx ) );
+    return( ctx->pk_info->get_bitlen( ctx->pk_ctx ) );
 }
 
 /*