diff --git a/src/pulses/instant_pulses.jl b/src/pulses/instant_pulses.jl
index 507ec1238b30eca7375cf9e83b75436bcdf58d31..595c1ddab3594e57f87607d8da1def2ff8e7f11f 100644
--- a/src/pulses/instant_pulses.jl
+++ b/src/pulses/instant_pulses.jl
@@ -20,7 +20,6 @@ function InstantRFPulseBlock(model::Model; flip_angle=nothing, phase=nothing)
         get_free_variable(model, phase)
     )
     @constraint model res.flip_angle >= 0
-    set_simple_constraints!(model, res, kwargs)
     return res
 end