diff --git a/metis_l1_prep.pro b/metis_l1_prep.pro
index 24718b42f6f9935b50b442c9c6d448a8dc7ef319..c48a8496846dc0402a2611e3d9893bc8d6a2d24f 100755
--- a/metis_l1_prep.pro
+++ b/metis_l1_prep.pro
@@ -86,7 +86,7 @@ pro metis_l1_prep
 	; definitions for the primary header
 	; version of the fits file
 
-	version = string(input.l1_version + 1, format = '(I02)')
+	version = string(input.l1_version, format = '(I02)')
 
 	; creation and acquisition times in utc
 
@@ -283,6 +283,7 @@ pro metis_l1_prep
 	fxaddpar, primary_header, 'CREATOR', 'metis_l1_prep.pro'
 	fxaddpar, primary_header, 'VERS_SW', input.sw_version
 	fxaddpar, primary_header, 'VERS_CAL', cal_pack.version, 'Version of the calibration package', after = 'VERS_SW'
+	fxaddpar, primary_header, 'VERSION', version
 	fxaddpar, primary_header, 'OBSRVTRY', 'Solar Orbiter', 'Satellite name', before = 'INSTRUME'
 	fxaddpar, primary_header, 'TELESCOP', telescope, 'Telescope that took the measurement', before = 'INSTRUME'
 	fxaddpar, primary_header, 'DETECTOR', detector, 'Subunit/sensor', before = 'DATAMIN'