diff --git a/glib/gbase64.c b/glib/gbase64.c
index baddae098..ef6a39832 100644
--- a/glib/gbase64.c
+++ b/glib/gbase64.c
@@ -105,7 +105,7 @@ g_base64_encode_step (const guchar *in,
   g_return_val_if_fail (state != NULL, 0);
   g_return_val_if_fail (save != NULL, 0);
 
-  if (len <= 0)
+  if (len == 0)
     return 0;
 
   inptr = in;
@@ -339,7 +339,7 @@ g_base64_decode_step (const gchar  *in,
   g_return_val_if_fail (state != NULL, 0);
   g_return_val_if_fail (save != NULL, 0);
 
-  if (len <= 0)
+  if (len == 0)
     return 0;
 
   inend = (const guchar *)in+len;