diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index d1a870bee68..db85d0b7535 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -4292,7 +4292,7 @@ static BOOL HTTP_ParseRfc850Date(LPCWSTR value, FILETIME *ft)
             return FALSE;
         }
     }
-    else if (ptr - value <= sizeof(day) / sizeof(day[0]))
+    else if (ptr - value < sizeof(day) / sizeof(day[0]))
     {
         memcpy(day, value, (ptr - value) * sizeof(WCHAR));
         day[ptr - value + 1] = 0;