diff --git a/src/containers/abstract.jl b/src/containers/abstract.jl
index ea301a8a58253ed1cc8c7f0147b074ff1c777142..bf18ab93a318d74a6bd94ec2ffb70f017e3c9263 100644
--- a/src/containers/abstract.jl
+++ b/src/containers/abstract.jl
@@ -1,5 +1,5 @@
 module Abstract
-import ...Variables: AbstractBlock, variables, VariableType, get_pulse, get_gradient, @defvar
+import ...Variables: AbstractBlock, variables, VariableType, get_pulse, get_gradient, @defvar, duration
 import ...Components: BaseComponent, InstantPulse, InstantGradient, ReadoutComponent, NoGradient, RFPulseComponent, GradientWaveform
 
 """