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We present the K-band spectrum of the cataclysmic variable RXJ 0502.8+1624(Tau 4). The spectrum shows a broad, smooth hump, with no absorption lines fromthe secondary star visible. This result indicates that the infrared light ofthis system is dominated by cyclotron emission, and, in combination with theoptical spectrum and X-ray properties, suggests that Tau 4 is a polar-typecataclysmic variable (CV).  The system was chosen for study because the broadband JHK colours of Tau 4are consistent with an L-type dwarf, suggesting that this system might harbouran elusive sub-stellar secondary star. The result presented here, along withthe recent discovery of cyclotron emission in the cataclysmic variable EF Eri,suggests that care must be taken when using the broadband JHK colours of CVswhen targeting searches for sub-stellar secondary starsComment: 4 pages, to appear as research note in A&

TheK-band spectrum of the cataclysmic variable RXJ 0502.8+1624 (Tau 4)