diff --git a/include/ffi.h.in b/include/ffi.h.in
index 96b8fd38..747dd170 100644
--- a/include/ffi.h.in
+++ b/include/ffi.h.in
@@ -270,7 +270,12 @@ size_t ffi_java_raw_size (ffi_cif *cif);
 __declspec(align(8))
 #endif
 typedef struct {
+#if @FFI_EXEC_TRAMPOLINE_TABLE@
+  void *trampoline_table;
+  void *trampoline_table_entry;
+#else
   char tramp[FFI_TRAMPOLINE_SIZE];
+#endif
   ffi_cif   *cif;
   void     (*fun)(ffi_cif*,void*,void**,void*);
   void      *user_data;
@@ -303,7 +308,12 @@ ffi_prep_closure_loc (ffi_closure*,
 # pragma pack 8
 #endif
 typedef struct {
+#if @FFI_EXEC_TRAMPOLINE_TABLE@
+  void *trampoline_table;
+  void *trampoline_table_entry;
+#else
   char tramp[FFI_TRAMPOLINE_SIZE];
+#endif
 
   ffi_cif   *cif;
 
@@ -324,7 +334,12 @@ typedef struct {
 } ffi_raw_closure;
 
 typedef struct {
+#if @FFI_EXEC_TRAMPOLINE_TABLE@
+  void *trampoline_table;
+  void *trampoline_table_entry;
+#else
   char tramp[FFI_TRAMPOLINE_SIZE];
+#endif
 
   ffi_cif   *cif;