diff --git a/inst/cta/include/GCTAEdisp2D.hpp b/inst/cta/include/GCTAEdisp2D.hpp
index 6baf505..353e2a5 100644
--- a/inst/cta/include/GCTAEdisp2D.hpp
+++ b/inst/cta/include/GCTAEdisp2D.hpp
@@ -189,6 +189,7 @@ GFilename GCTAEdisp2D::filename(void) const
 inline
 const GCTAResponseTable& GCTAEdisp2D::table(void) const
 {
+    fetch();
     return (m_edisp);
 }