diff --git a/library/md5.c b/library/md5.c
index 1c5b397..7a449b2 100644
--- a/library/md5.c
+++ b/library/md5.c
@@ -304,7 +304,7 @@
     unsigned char buf[1024];
 
     if( ( f = fopen( path, "rb" ) ) == NULL )
-        return( 1 );
+        return( POLARSSL_ERR_MD5_FILE_IO_ERROR );
 
     md5_starts( &ctx );
 
@@ -318,7 +318,7 @@
     if( ferror( f ) != 0 )
     {
         fclose( f );
-        return( 2 );
+        return( POLARSSL_ERR_MD5_FILE_IO_ERROR );
     }
 
     fclose( f );