diff --git a/src/mac/carbon/checklst.cpp b/src/mac/carbon/checklst.cpp
index 84cad9fe34..4f8bc5723b 100644
--- a/src/mac/carbon/checklst.cpp
+++ b/src/mac/carbon/checklst.cpp
@@ -36,11 +36,27 @@ const short kwxMacListWithVerticalScrollbar = 128 ;
 const short kwxMacListItemHeight = 14 ;
 const short kwxMacListCheckboxWidth = 14 ;
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=mac68k
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(push, 2)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack(2)
+#endif
+
 typedef struct {
  unsigned short instruction;
  void (*function)();
 } ldefRec, *ldefPtr, **ldefHandle;
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=reset
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(pop)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack()
+#endif
+
 extern "C"
 {
 static pascal void wxMacCheckListDefinition( short message, Boolean isSelected, Rect *drawRect,
diff --git a/src/mac/carbon/listbox.cpp b/src/mac/carbon/listbox.cpp
index 3e5ae1bc37..91595e5f38 100644
--- a/src/mac/carbon/listbox.cpp
+++ b/src/mac/carbon/listbox.cpp
@@ -32,12 +32,27 @@ END_EVENT_TABLE()
 
 #include "wx/mac/uma.h"
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=mac68k
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(push, 2)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack(2)
+#endif
 
 typedef struct {
  unsigned short instruction;
  void (*function)();
 } ldefRec, *ldefPtr, **ldefHandle;
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=reset
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(pop)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack()
+#endif
+
 extern "C"
 {
 static pascal void wxMacListDefinition( short message, Boolean isSelected, Rect *drawRect,
diff --git a/src/mac/checklst.cpp b/src/mac/checklst.cpp
index 84cad9fe34..4f8bc5723b 100644
--- a/src/mac/checklst.cpp
+++ b/src/mac/checklst.cpp
@@ -36,11 +36,27 @@ const short kwxMacListWithVerticalScrollbar = 128 ;
 const short kwxMacListItemHeight = 14 ;
 const short kwxMacListCheckboxWidth = 14 ;
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=mac68k
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(push, 2)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack(2)
+#endif
+
 typedef struct {
  unsigned short instruction;
  void (*function)();
 } ldefRec, *ldefPtr, **ldefHandle;
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=reset
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(pop)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack()
+#endif
+
 extern "C"
 {
 static pascal void wxMacCheckListDefinition( short message, Boolean isSelected, Rect *drawRect,
diff --git a/src/mac/listbox.cpp b/src/mac/listbox.cpp
index 3e5ae1bc37..91595e5f38 100644
--- a/src/mac/listbox.cpp
+++ b/src/mac/listbox.cpp
@@ -32,12 +32,27 @@ END_EVENT_TABLE()
 
 #include "wx/mac/uma.h"
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=mac68k
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(push, 2)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack(2)
+#endif
 
 typedef struct {
  unsigned short instruction;
  void (*function)();
 } ldefRec, *ldefPtr, **ldefHandle;
 
+#if PRAGMA_STRUCT_ALIGN
+    #pragma options align=reset
+#elif PRAGMA_STRUCT_PACKPUSH
+    #pragma pack(pop)
+#elif PRAGMA_STRUCT_PACK
+    #pragma pack()
+#endif
+
 extern "C"
 {
 static pascal void wxMacListDefinition( short message, Boolean isSelected, Rect *drawRect,