diff --git a/iop/hdd/apa-bdm/Makefile b/iop/hdd/apa-bdm/Makefile
index 8d8ab865363..73aa4bd6b4a 100644
--- a/iop/hdd/apa-bdm/Makefile
+++ b/iop/hdd/apa-bdm/Makefile
@@ -14,4 +14,6 @@ APA_USE_DEV9 ?= 0
 APA_USE_ATAD ?= 0
 APA_USE_BDM ?= 1
 
+IOP_CFLAGS += -DAPA_POSIX_VER
+
 include $(PS2SDKSRC)/iop/hdd/apa/Makefile