diff --git a/src/MadsCalibrate.jl b/src/MadsCalibrate.jl
index aef99b56..89183d8e 100644
--- a/src/MadsCalibrate.jl
+++ b/src/MadsCalibrate.jl
@@ -4,6 +4,7 @@ import SharedArrays
 import Statistics
 import Optim
 import ProgressMeter
+import JLD2
 
 """
 Calibrate with random initial guesses