diff --git a/gbsdk/rules.mk b/gbsdk/rules.mk
index fba758e..a04ec36 100644
--- a/gbsdk/rules.mk
+++ b/gbsdk/rules.mk
@@ -160,7 +160,7 @@ $(BUILD)/assets/%.1bpp: assets/%.png
 # Special hack to place a ret instruction at the end of the GSINIT section.
 # This has to be linked last, as that ensures that this fragment is at the end of the "GSINIT" section.
 $(BUILD)/gsinit.end.o:
-	@/bin/echo -e 'SECTION FRAGMENT "GSINIT", ROMX, BANK[1]\n  ret' | rgbasm - -o $@
+	@printf 'SECTION FRAGMENT "GSINIT", ROMX, BANK[1]\n  ret' | rgbasm - -o $@
 
 clean:
 	@rm -rf $(BUILD) $(PROJECT_NAME).$(ROM_EXTENSION) $(PROJECT_NAME).map $(PROJECT_NAME).sym
diff --git a/scripts/generate_map.py b/scripts/generate_map.py
index 935e239..799edb3 100644
--- a/scripts/generate_map.py
+++ b/scripts/generate_map.py
@@ -24,7 +24,7 @@ Point = Tuple[int, int]
 
 def generate_coll_map(
     in_path: pathlib.Path, width: int, height: int, compress: bool = False
-) -> Tuple[str, Point, Point]:
+) -> Tuple[bytes, Point, Point]:
     png = Image.open(in_path).convert("RGB")
     if png.width % 8 != 0 or png.height % 8 != 0:
         abort(f"file '{in_path}' has invalid dimensions (should be multiple of 8)")
@@ -69,7 +69,7 @@ def generate_coll_map(
     if spawn is None:
         abort(f"no spawn point located")
 
-    return format_bytes(out_bytes, width=width), spawn, camera
+    return bytes(out_bytes), spawn, camera
 
 
 def format_bytes(data: bytes, width: int = 16) -> str:
@@ -115,10 +115,14 @@ def generate_map(pngfile: str, compress: bool = False) -> None:
     )
 
     collpath = pngpath.parent / pngpath.name.replace(".png", "_coll.png")
+    collpath_out = pngpath.parent / f"{section}.collision"
     coll_map, spawn, camera = generate_coll_map(
         collpath, width, height, compress=compress
     )
 
+    with open(collpath_out, "wb") as outf:
+        outf.write(coll_map)
+
     tiles_size = os.path.getsize(tilepath)
 
     with open(incpath, "w") as outf:
@@ -140,11 +144,7 @@ extern map_t map_{section};
 
 MAP_ASSET({section}_tiles, "{section}.tiles");
 MAP_ASSET({section}_map, "{section}.tilemap");
-//MAP_ASSET({section}_collision, "{section}.collision");
-
-const uint8_t {section}_collision[] = {{
-{coll_map}
-}};
+MAP_ASSET({section}_collision, "{section}.collision");
 
 const map_t map_{section} = {{
     (uint16_t)&{section}_tiles[0],