diff --git a/DataSpec/DNACommon/CRSC.cpp b/DataSpec/DNACommon/CRSC.cpp
index 2eda63686..b0e077448 100644
--- a/DataSpec/DNACommon/CRSC.cpp
+++ b/DataSpec/DNACommon/CRSC.cpp
@@ -286,6 +286,7 @@ void CRSM<IDType>::write(athena::io::IStreamWriter& w) const
         w.writeBytes("FOFFCNST", 8);
         w.writeFloatBig(x34_FOFF);
     }
+    w.writeBytes("_END", 4);
 }
 
 template <class IDType>
diff --git a/DataSpec/DNACommon/ELSC.cpp b/DataSpec/DNACommon/ELSC.cpp
index d8c8c4e74..26c69cb20 100644
--- a/DataSpec/DNACommon/ELSC.cpp
+++ b/DataSpec/DNACommon/ELSC.cpp
@@ -441,6 +441,7 @@ void ELSM<IDType>::write(athena::io::IStreamWriter& w) const
         w.writeBytes((atInt8*)"ZERY", 4);
         x70_ZERY.write(w);
     }
+    w.writeBytes("_END", 4);
 }
 
 template struct ELSM<UniqueID32>;
diff --git a/DataSpec/DNACommon/PART.cpp b/DataSpec/DNACommon/PART.cpp
index b840ab3fd..945168d64 100644
--- a/DataSpec/DNACommon/PART.cpp
+++ b/DataSpec/DNACommon/PART.cpp
@@ -1529,6 +1529,7 @@ void GPSM<IDType>::write(athena::io::IStreamWriter& w) const
         w.writeBytes((atInt8*)"ADV8", 4);
         x128_ADV8.write(w);
     }
+    w.writeBytes("_END", 4);
 }
 
 template struct GPSM<UniqueID32>;
diff --git a/DataSpec/DNACommon/SWHC.cpp b/DataSpec/DNACommon/SWHC.cpp
index a6e797303..9e550653a 100644
--- a/DataSpec/DNACommon/SWHC.cpp
+++ b/DataSpec/DNACommon/SWHC.cpp
@@ -535,6 +535,7 @@ void SWSH<IDType>::write(athena::io::IStreamWriter& w) const
         w.writeBytes("ORNTCNST\x01", 9);
     if (x45_26_CRND)
         w.writeBytes("CRNDCNST\x01", 9);
+    w.writeBytes("_END", 4);
 }
 
 template struct SWSH<UniqueID32>;