diff --git a/definitions/mars/grib.mmsf.fc.def b/definitions/mars/grib.mmsf.fc.def
index 956d601a5..8791cb086 100644
--- a/definitions/mars/grib.mmsf.fc.def
+++ b/definitions/mars/grib.mmsf.fc.def
@@ -8,6 +8,7 @@ if (class is "od") { alias mars.system = systemNumber; }
 if (class is "me") { alias mars.system = systemNumber; }
 if (class is "en") { alias mars.system = systemNumber; }
 if (class is "c3") { alias mars.system = systemNumber; }
+if (class is "ci") { alias mars.system = systemNumber; }
 alias mars.number = perturbationNumber;
 alias mars.method = methodNumber;
 
diff --git a/definitions/mars/grib.msmm.fcmean.def b/definitions/mars/grib.msmm.fcmean.def
index 800a49134..a13ca9918 100644
--- a/definitions/mars/grib.msmm.fcmean.def
+++ b/definitions/mars/grib.msmm.fcmean.def
@@ -10,6 +10,7 @@ if (class is "od") { alias mars.system = systemNumber; }
 if (class is "me") { alias mars.system = systemNumber; }
 if (class is "en") { alias mars.system = systemNumber; }
 if (class is "c3") { alias mars.system = systemNumber; }
+if (class is "ci") { alias mars.system = systemNumber; }
 
 # See ECC-624
 if (centre == 80 && subCentre == 98 && class is "c3") {