The Indian rupee strengthened marginally by four paise against the US dollar in the opening trade on Tuesday on expectations of more capital inflows by foreign funds as stock market may open in positive zone in line with other Asian bourses.

Weak dollar against some other Asian currencies also supported the Indian rupee. At the Interbank Foreign Exchange (Forex) market, the domestic unit gained another 4 paise to quote at 48.61 a dollar over the previous close.