The League One side took the lead in the first half when Gary Alexander's shot was deflected past Danny Coyne by David Wheater.
But defender Rhys Williams earned a draw for Boro when he lashed home from 20 yards nine minutes from time for his fourth goal of pre-season.
It looks decent on paper ... but let's be honest, Gareth Southgate's side were hardly punching above their weight this pre-season.
Five games and every one against a side below them in the league ... yet none of them at the Riverside.
BORO PRE-SEASON FIXTURES
MACCLESFIELD 0 BORO 3 (Arca pen, Emnes, Franks)
(1st half) Coyne, Hoyte, Huth, Williams, Grounds, Yeates, Walker, Digard, Cronesberry, Aliadiere, Martin. (2nd half) Coyne, McMahon, Bates, Hines, Johnson, Smallwood, O'Neil, Arca, Porritt, Emnes, Franks.
DUMBARTON 0 BORO 5 (O'Neil, Dunlop og, Aliadiere pen, Johnson, Williams)
Jones (Coyne 46), Hoyte (McMahon 72), Bates (Wheater 72), Huth (Hines 72), Grounds (Taylor 72), O'Neil (J Johnson 72), Arca (Capt) (Williams 72), Digard (Walker 29), Yeates (A Johnson 65), Aliadiere (Franks 46), Emnes (Porritt 63).
CARLISLE 0 BORO 2 (Johnson, Williams)
Jones (Coyne 60),McMahon,Taylor (Williams 72),Bates(Walker 24),Huth,Wheater (Hines 60),O'Neil,Arca(Hoyte 60) 60),Franks,Yeates (Porritt 72),A Johnson (Martin 84)
OLDHAM 2 BORO 2 (Williams, Huth)
Coyne; Williams, Wheater (Huth 64), Hines, A Taylor; Hoyte (McMahon 64), Walker (Yeates 54), Arca (Smallwood 79), A Johnson (Martin78); Aliadiere(J Johnson 78) Franks (Porritt 78) Substitutes (not used): Ripley
MILLWALL 1 BORO 1 (Williams)
Coyne (Jones 46), Hoyte (McMahon, 61), Huth, Wheater, Ground, Yeates, Arca (O'Neill 46), Digard (Williams, 61), Johnson, Aliadiere, Emnes (Franks, 81) Subs not used: Adan Smith, Seb Hines , Andrew Taylor, Josh Walker, Nathan Porritt Goals: Wheater OG 27mins, Williams 78m.