A drug delivery device comprising at least: - a housing adapted to receive a primary container with a piston , - a plunger slidably disposed in the housing and adapted to drive the piston for delivering a medicament, - a drive spring pre-loaded between the housing and the plunger so as to urge the plunger in a distal direction (D), - an audible and/or tactile indicator providing an indication to a user at or near an end of delivery of the medicament, wherein the indicator is a biasing member, - a trigger mechanism arranged between the indicator and the plunger , wherein the trigger mechanism comprises at least one structure (60.1) resiliently abuting the plunger , wherein the plunger provides at least one cut-out (40.1) adapted to receive the at least one structure (60.1) at or near the end of delivery of the medicament, wherein the cut-out (40.1) comprises a lateral inclined edge (40.1.1), wherein the drug delivery device ensures that the trigger mechanism activates the audible and/or tactile indicator regardless of the length of the plunger , and wherein the trigger mechanism is configured - to support the indicator in an initial state of the device and during delivery of the medicament, wherein the at least one structure (60.1) is supported by the plunger and thereby supports the indicator in a biased state (S2), and - to couple with the plunger to activate the audible and/or tactile indicator at or near the end of delivery of the medicament, wherein the at least one cut-out (40.1) receives the at least one structure (60.1). - a housing adapted to receive a primary container with a piston , - a plunger slidably disposed in the housing and adapted to drive the piston for delivering a medicament, - a drive spring pre-loaded between the housing and the plunger so as to urge the plunger in a distal direction (D), - an audible and/or tactile indicator providing an indication to a user at or near an end of delivery of the medicament, wherein the indicator is a biasing member, - a trigger mechanism arranged between the indicator and the plunger , wherein the trigger mechanism comprises at least one structure (60.1) resiliently abuting the plunger , wherein the plunger provides at least one cut-out (40.1) adapted to receive the at least one structure (60.1) at or near the end of delivery of the medicament, wherein the cut-out (40.1) comprises a lateral inclined edge (40.1.1), wherein the drug delivery device ensures that the trigger mechanism activates the audible and/or tactile indicator regardless of the length of the plunger , and wherein the trigger mechanism is configured - to support the indicator in an initial state of the device and during delivery of the medicament, wherein the at least one structure (60.1) is supported by the plunger and thereby supports the indicator in a biased state (S2), and - to couple with the plunger to activate the audible and/or tactile indicator at or near the end of delivery of the medicament, wherein the at least one cut-out (40.1) receives the at least one structure (60.1). - to support the indicator in an initial state of the device and during delivery of the medicament, wherein the at least one structure (60.1) is supported by the plunger and thereby supports the indicator in a biased state (S2), and - to couple with the plunger to activate the audible and/or tactile indicator at or near the end of delivery of the medicament, wherein the at least one cut-out (40.1) receives the at least one structure (60.1). <EOS>