diff --git a/implementations/uvm-ncc/GNUmakefile b/implementations/uvm-ncc/GNUmakefile
index aa43115..72d57dd 100644
--- a/implementations/uvm-ncc/GNUmakefile
+++ b/implementations/uvm-ncc/GNUmakefile
@@ -7,7 +7,7 @@ UVM_VM=$(UVM)/vm
 run: $(UVM_NCC)/out.asm
 	cd $(UVM_VM) ; cargo run $(UVM_NCC)/out.asm
 
-$(UVM_NCC)/out.asm: $(UVM_JOY)/xerblin.c $(UVM_JOY)/font/font.h
+$(UVM_NCC)/out.asm: $(UVM_JOY)/xerblin.c $(UVM_JOY)/graphics.h $(UVM_JOY)/font/font.h
 	cd $(UVM_NCC) ; cargo run $(UVM_JOY)/xerblin.c
 
 $(UVM_JOY)/font/font.h:
diff --git a/implementations/uvm-ncc/graphics.h b/implementations/uvm-ncc/graphics.h
index a915d1c..47a36ad 100644
--- a/implementations/uvm-ncc/graphics.h
+++ b/implementations/uvm-ncc/graphics.h
@@ -4,12 +4,11 @@ draw_background(u32* buffer, size_t w, size_t h)
 {
 	for (size_t x = 0; x < w; ++x) {
 		for (size_t y = 0; y < h; ++y) {
-			u32* pix_ptr = frame_buffer + w * y + x;
 			u8 blue = x & 255;
 			u8 green = y & 255;
 			u8 red = (x + y + 128) & 255;
-			u8 alpha = 123;
-			*pix_ptr = (alpha << 24) | (red << 16) | (green << 8) | blue;
+			u32* pix_ptr = buffer + w * y + x;
+			*pix_ptr = (red << 16) | (green << 8) | blue;
 		}
 	}
 }