diff --git a/source/sw/src/game.cpp b/source/sw/src/game.cpp
index 437d5eadf..59a44d5c3 100644
--- a/source/sw/src/game.cpp
+++ b/source/sw/src/game.cpp
@@ -4810,23 +4810,20 @@ void G_Polymer_UnInit(void) { }
 
 #include "saveable.h"
 
-static saveable_data saveable_build_data[] =
-{
-    SAVE_DATA(sector),
-    SAVE_DATA(sprite),
-    SAVE_DATA(wall)
-};
+saveable_module saveable_build{};
 
-saveable_module saveable_build =
+void Saveable_Init_Dynamic()
 {
-    // code
-    NULL,
-    0,
+    static saveable_data saveable_build_data[] =
+    {
+        {sector, MAXSECTORS*sizeof(sectortype)},
+        {sprite, MAXSPRITES*sizeof(spritetype)},
+        {wall, MAXWALLS*sizeof(walltype)},
+    };
 
-    // data
-    saveable_build_data,
-    NUM_SAVEABLE_ITEMS(saveable_build_data)
-};
+    saveable_build.data = saveable_build_data;
+    saveable_build.numdata = NUM_SAVEABLE_ITEMS(saveable_build_data);
+}
 
 /*extern*/ bool GameInterface::validate_hud(int requested_size) { return requested_size; }
 /*extern*/ void GameInterface::set_hud_layout(int requested_size) { /* the relevant setting is gs.BorderNum */}
diff --git a/source/sw/src/saveable.cpp b/source/sw/src/saveable.cpp
index c568b1593..67e8339da 100644
--- a/source/sw/src/saveable.cpp
+++ b/source/sw/src/saveable.cpp
@@ -38,6 +38,8 @@ void Saveable_Init(void)
 {
     if (nummodules > 0) return;
 
+    Saveable_Init_Dynamic();
+
 #define MODULE(x) { \
         extern saveable_module saveable_ ## x; \
         saveablemodules[nummodules++] = &saveable_ ## x; \
diff --git a/source/sw/src/saveable.h b/source/sw/src/saveable.h
index 657abadf4..0a288d058 100644
--- a/source/sw/src/saveable.h
+++ b/source/sw/src/saveable.h
@@ -24,6 +24,7 @@
 #ifndef SAVEABLE_H
 #define SAVEABLE_H
 
+#include "compat.h"
 
 typedef void *saveable_code;
 
@@ -42,10 +43,16 @@ typedef struct
     unsigned int numdata;
 } saveable_module;
 
-#define SAVE_CODE(s) (void*)s
-#define SAVE_DATA(s) { (void*)&s, sizeof(s) }
+template <typename T>
+static FORCE_INLINE constexpr enable_if_t<!std::is_pointer<T>::value, size_t> SAVE_SIZEOF(T const & obj) noexcept
+{
+    return sizeof(obj);
+}
 
-#define NUM_SAVEABLE_ITEMS(x) (sizeof(x)/sizeof(x[0]))
+#define SAVE_CODE(s) (void*)(s)
+#define SAVE_DATA(s) { (void*)&(s), SAVE_SIZEOF(s) }
+
+#define NUM_SAVEABLE_ITEMS(x) ARRAY_SIZE(x)
 
 typedef struct
 {
@@ -61,6 +68,7 @@ typedef struct
 } saveddatasym;
 
 void Saveable_Init(void);
+void Saveable_Init_Dynamic(void);
 
 int Saveable_FindCodeSym(void *ptr, savedcodesym *sym);
 int Saveable_FindDataSym(void *ptr, saveddatasym *sym);