diff --git a/CHANGELOG.md b/CHANGELOG.md
index 858021a39..c624387b8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+equipment: mark gas mixes reported by the dive computer as 'inactive' as 'not used'
 desktop: added button to hide the infobox in the dive profile
 desktop: use persisted device information for the dive computer configuration
 core: fix bug using salinity and pressure values in mbar <-> depth conversion
diff --git a/core/libdivecomputer.c b/core/libdivecomputer.c
index bc4d06210..94988c516 100644
--- a/core/libdivecomputer.c
+++ b/core/libdivecomputer.c
@@ -151,7 +151,10 @@ static int parse_gasmixes(device_data_t *devdata, struct dive *dive, dc_parser_t
 			cyl.gasmix.he.permille = he;
 		}
 
-		if (dive->dc.divemode == CCR)
+		if (rc == DC_STATUS_UNSUPPORTED)
+			// Gasmix is inactive
+			cyl.cylinder_use = NOT_USED;
+		else if (dive->dc.divemode == CCR)
 			cyl.cylinder_use = DILUENT;
 		else
 			cyl.cylinder_use = OC_GAS;