diff --git a/Makefile b/Makefile
index badd35e2..f0d1225c 100644
--- a/Makefile
+++ b/Makefile
@@ -191,6 +191,7 @@ build/src/main/1EB50.o: OPTFLAGS := -O1 -g0
 build/src/libultra/2BDF0.o: OPTFLAGS := -O1 -g0
 build/src/libultra/2C700.o: OPTFLAGS := -O1 -g0
 build/src/libultra/2D300.o: OPTFLAGS := -O1 -g0
+build/src/libultra/io/controller.o: OPTFLAGS := -O1 -g0
 
 # cc & asm-processor
 build/src/%.o: CC := $(ASM_PROC) $(ASM_PROC_FLAGS) $(CC) -- $(AS) $(ASFLAGS) --