diff --git a/GpApp/GliderStructs.h b/GpApp/GliderStructs.h
index 63c9c63..316577a 100644
--- a/GpApp/GliderStructs.h
+++ b/GpApp/GliderStructs.h
@@ -7,6 +7,7 @@
 
 #include "PLQDOffscreen.h"
 #include "GpVOSEvent.h"
+#include "ByteSwap.h"
 
 typedef struct
 {
@@ -346,7 +347,7 @@ typedef struct
 
 typedef struct
 {
-	Int32		frame;
+	BEInt32_t	frame;
 	char		key;
 	char		padding;
 } demoType, *demoPtr;
diff --git a/GpApp/StructuresInit2.cpp b/GpApp/StructuresInit2.cpp
index 2d034db..86abde7 100644
--- a/GpApp/StructuresInit2.cpp
+++ b/GpApp/StructuresInit2.cpp
@@ -288,6 +288,8 @@ void CreatePointers (void)
 		RedAlert(kErrNoMemory);
 	else
 	{
+		PL_STATIC_ASSERT(sizeof(demoType) == 6);
+
 		BlockMove(*tempHandle, demoData, kDemoLength);
 		tempHandle.Dispose();
 	}