diff --git a/src/gsi/gsi_files.cmake b/src/gsi/gsi_files.cmake
index d4b6e6b3e..5c5c4ec5a 100644
--- a/src/gsi/gsi_files.cmake
+++ b/src/gsi/gsi_files.cmake
@@ -498,6 +498,7 @@ read_goesndr.f90
 read_gps.f90
 read_guess.F90
 read_iasi.f90
+read_iasing.f90
 read_l2bufr_mod.f90
 read_lag.f90
 read_lidar.f90