diff --git a/jungfrau/JFModuleGainCalibration.cpp b/jungfrau/JFModuleGainCalibration.cpp
index 27888062..d6b01410 100644
--- a/jungfrau/JFModuleGainCalibration.cpp
+++ b/jungfrau/JFModuleGainCalibration.cpp
@@ -114,7 +114,8 @@ double JFModuleGainCalibration::GetHG0StdDev() const {
     return GetStdDev(offset_hg0);
 }
 
-JFGainCalibration::JFGainCalibration(const std::vector<std::string>& filenames) {
+void JFGainCalibration::LoadGain(const std::vector<std::string>& filenames) {
+    c.clear();
     for (const auto& filename : filenames)
         c.emplace_back(filename);
 }