diff --git a/src/helper_functions.jl b/src/helper_functions.jl
index eb68cbd3f5afd8d578d76b6f9c6d4e1cea584d40..8cde23528c41b2fbf97371a34b19bc345d9b0e26 100644
--- a/src/helper_functions.jl
+++ b/src/helper_functions.jl
@@ -4,6 +4,7 @@ import ..BuildSequences: get_global_model
 import ..Sequences: Sequence
 import ..Pulses: SincPulse, ConstantPulse, InstantRFPulseBlock
 import ..Overlapping: TrapezoidGradient
+import ..Variables: qvec
 
 """
     excitation_pulse(; parameters...)