diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94f1f5d..98169d6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,7 +34,7 @@ set(ASSETS
 fxconv_declare_assets(${ASSETS} WITH_METADATA)
 
 add_executable(myaddin ${SOURCES} ${ASSETS} ${ASSETS_${FXSDK_PLATFORM}})
-target_compile_options(myaddin PRIVATE -Wall -Wextra -Os)
+target_compile_options(myaddin PRIVATE -Wall -Wextra -O2)
 target_link_libraries(myaddin Gint::Gint)
 
 generate_g3a(TARGET myaddin OUTPUT "hyperultra.g3a" NAME ""
diff --git a/src/map.c b/src/map.c
index c572854..05774c6 100644
--- a/src/map.c
+++ b/src/map.c
@@ -66,10 +66,10 @@ draw_outline(int x, int y)
 	const int down = (map_get(x, y + 1) == 1);
 	x *= TSIZE;
 	y *= TSIZE;
-	if (!left)  LZY_DrawRect(x, y, 1, TSIZE);
-	if (!right) LZY_DrawRect(x + TSIZE - 1, y, 1, TSIZE);
-	if (!up)    LZY_DrawRect(x, y, TSIZE, 1);
-	if (!down)  LZY_DrawRect(x, y + TSIZE - 1, TSIZE, 1);
+	if (!left)  LZY_DrawFillRect(x, y, 1, TSIZE);
+	if (!right) LZY_DrawFillRect(x + TSIZE - 1, y, 1, TSIZE);
+	if (!up)    LZY_DrawFillRect(x, y, TSIZE, 1);
+	if (!down)  LZY_DrawFillRect(x, y + TSIZE - 1, TSIZE, 1);
 }
 
 void