diff --git a/testes/strings.lua b/testes/strings.lua
index 97875ec0..f2f61413 100644
--- a/testes/strings.lua
+++ b/testes/strings.lua
@@ -309,8 +309,8 @@ do print("testing 'format %a %A'")
     matchhexa(n)
   end
 
-  assert(string.find(string.format("%A", 0.0), "^0X0%.?0?P%+?0$"))
-  assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0?p%+?0$"))
+  assert(string.find(string.format("%A", 0.0), "^0X0%.?0*P%+?0$"))
+  assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0*p%+?0$"))
 
   if not _port then   -- test inf, -inf, NaN, and -0.0
     assert(string.find(string.format("%a", 1/0), "^inf"))