diff --git a/include/ffi.h.in b/include/ffi.h.in
index 92e38c42..501f16e5 100644
--- a/include/ffi.h.in
+++ b/include/ffi.h.in
@@ -257,7 +257,12 @@ 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;
@@ -284,7 +289,12 @@ ffi_prep_closure_loc (ffi_closure*,
 		      void*codeloc);
 
 typedef struct {
+#if FFI_EXEC_TRAMPOLINE_TABLE
+  void *trampoline_table;
+  void *trampoline_table_entry;
+#else
   char tramp[FFI_TRAMPOLINE_SIZE];
+#endif
 
   ffi_cif   *cif;
 
@@ -305,7 +315,12 @@ 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;