diff --git a/mission/acs/defs.h b/mission/acs/defs.h
index 8cdd283b..baed276d 100644
--- a/mission/acs/defs.h
+++ b/mission/acs/defs.h
@@ -45,7 +45,7 @@ enum SafeModeStrategy : uint8_t {
 enum GpsSource : uint8_t {
   NONE,
   GPS,
-  PROPAGATION,
+  GPS_EXTRAPOLATED,
   SPG4,
 };