Abstract: The invention relates to a corridor indicator lamp (1). The corridor indicator lamp (1) comprises a base assembly (12) which includes a plurality of compartments (4) and a plurality of separator walls (46). The compartments (4) are open towards a front side (14) of the corridor indicator lamp (1). The separator walls (46) separate at least some of the plurality of compartments (4). In order to improve visibility of the indicator lamp (1), an extension unit (54) is provided according to the invention. The extension unit (54) is configured to be mounted to the base assembly (12) and has a plurality of extension walls (58). An at least partly transparent cover (16) may be further provided, which is adapted to receive the extension unit (54).