diff --git a/Makefile b/Makefile
index 797d2cff..e786b458 100755
--- a/Makefile
+++ b/Makefile
@@ -263,7 +263,6 @@ $(BUILD_DIR)/lib/src/os/osCreatePiManager.o: OPT_FLAGS := -O2
 $(BUILD_DIR)/lib/src/printf.o : OPT_FLAGS := -O3
 $(BUILD_DIR)/lib/src/unknown_0C91A0.o : OPT_FLAGS := -O1
 $(BUILD_DIR)/lib/src/unknown_0D29F0.o: OPT_FLAGS := -O1
-$(BUILD_DIR)/lib/src/unknown_0CDE90.o: OPT_FLAGS := -O1
 $(BUILD_DIR)/lib/src/unknown_0D3160.o: OPT_FLAGS := -O1
 $(BUILD_DIR)/lib/src/unknown_0D3360.o: OPT_FLAGS := -O1
 $(BUILD_DIR)/lib/src/unknown_0D5EC0.o: OPT_FLAGS := -O1
diff --git a/lib/src/osAiGetLength.c b/lib/src/os/osAiGetLength.c
similarity index 100%
rename from lib/src/osAiGetLength.c
rename to lib/src/os/osAiGetLength.c
diff --git a/lib/src/unknown_0CDE90.c b/lib/src/os/osPfsIsPlug.c
similarity index 100%
rename from lib/src/unknown_0CDE90.c
rename to lib/src/os/osPfsIsPlug.c