diff --git a/src/PowerSystemsInvestmentsPortfolios.jl b/src/PowerSystemsInvestmentsPortfolios.jl
index 81e8a98..9d35082 100644
--- a/src/PowerSystemsInvestmentsPortfolios.jl
+++ b/src/PowerSystemsInvestmentsPortfolios.jl
@@ -14,6 +14,7 @@ import InfrastructureSystems:
     get_time_series_timestamps,
     get_time_series_values,
     get_time_series_names,
+    InfrastructureSystemsInternal,
     CompressionSettings,
     CompressionTypes,
     MultiLogger,