diff --git a/edosl0util/headers.py b/edosl0util/headers.py
index 8837e12bd0fa991815cd8e6de27dc42e7c665ceb..8b37aa8c1e89d283a09640e0e46f0c84da069bbc 100644
--- a/edosl0util/headers.py
+++ b/edosl0util/headers.py
@@ -106,15 +106,14 @@ class SpacecraftBusSecondaryHeader(BaseStruct):
 def amsu_headers():
     return {
         # AMSU-A1
-        (257, GROUP_CONTINUING): GirdSecondaryHeader,
-        (259, GROUP_CONTINUING): GirdSecondaryHeader,
-        (260, GROUP_CONTINUING): GirdSecondaryHeader,
-        (261, GROUP_CONTINUING): GirdSecondaryHeader,
-        (261, GROUP_CONTINUING): GirdSecondaryHeader,
-        (262, GROUP_CONTINUING): GirdSecondaryHeader,
+        (257, GROUP_FIRST): GirdSecondaryHeader,
+        (259, GROUP_FIRST): GirdSecondaryHeader,
+        (260, GROUP_FIRST): GirdSecondaryHeader,
+        (261, GROUP_FIRST): GirdSecondaryHeader,
+        (262, GROUP_FIRST): GirdSecondaryHeader,
         # AMSU-A2
-        (288, GROUP_CONTINUING): GirdSecondaryHeader,
-        (289, GROUP_CONTINUING): GirdSecondaryHeader,
+        (288, GROUP_FIRST): GirdSecondaryHeader,
+        (289, GROUP_FIRST): GirdSecondaryHeader,
         (290, GROUP_STANDALONE): GirdSecondaryHeader,
     }