diff --git a/eive_tmtc/tmtc/acs/acs_ctrl.py b/eive_tmtc/tmtc/acs/acs_ctrl.py
index 96f35e8..c7008f2 100644
--- a/eive_tmtc/tmtc/acs/acs_ctrl.py
+++ b/eive_tmtc/tmtc/acs/acs_ctrl.py
@@ -1063,7 +1063,7 @@ def handle_gps_data_processed(pw: PrintWrapper, hk_data: bytes):
     source = [
         f"{val:8.3f}"
         for val in struct.unpack(
-            fmt_vec, hk_data[current_idx: current_idx + inc_len_source]
+            fmt_source, hk_data[current_idx: current_idx + inc_len_source]
         )
     ]
     current_idx += inc_len_source