diff --git a/include/dalist/dalist_env.h b/include/dalist/dalist_env.h
index 8c8ab0f..ee27f58 100644
--- a/include/dalist/dalist_env.h
+++ b/include/dalist/dalist_env.h
@@ -1,7 +1,7 @@
 #ifndef DALIST_ENV_H
 #define DALIST_ENV_H
 
-#if defined (MIDIPIX_FREESTANDING)
+#if defined (_MIDIPIX_FREESTANDING)
 
 #include <psxtypes/psxtypes.h>
 
diff --git a/project/extras.mk b/project/extras.mk
index 24a9529..9033403 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -2,7 +2,7 @@ CFLAGS_SHARED_ATTR 	+= -DDALIST_EXPORT
 CFLAGS_STATIC_ATTR 	+= -DDALIST_STATIC
 
 ifeq ($(OS_BINFMT),PE)
-	CFLAGS_CONFIG 	+= -DMIDIPIX_FREESTANDING -D__NT$(HOST_BITS)
+	CFLAGS_CONFIG 	+= -D_MIDIPIX_FREESTANDING -D__NT$(HOST_BITS)
 	CFLAGS_CONFIG 	+= -UWIN32 -U_WIN32 -U__WIN32 -U__WIN32__
 	CFLAGS_CONFIG 	+= -UWIN64 -U_WIN64 -U__WIN64 -U__WIN64__
 
diff --git a/src/dalist_entry_point.c b/src/dalist_entry_point.c
index c8d37aa..d8d1a53 100644
--- a/src/dalist_entry_point.c
+++ b/src/dalist_entry_point.c
@@ -1,4 +1,4 @@
-#ifdef MIDIPIX_FREESTANDING
+#ifdef _MIDIPIX_FREESTANDING
 
 #include <dalist/dalist.h>
 
diff --git a/src/dalist_impl.h b/src/dalist_impl.h
index d80c65e..3207600 100644
--- a/src/dalist_impl.h
+++ b/src/dalist_impl.h
@@ -17,7 +17,7 @@ typedef dalist_memfn_nt_allocvm	memfn_allocvm;
 #define NT_MEM_RELEASE			(0x8000u)
 
 /* host environment */
-#if defined (MIDIPIX_FREESTANDING)
+#if defined (_MIDIPIX_FREESTANDING)
 #define dalist_errno(x) x
 #define PROT_READ	1
 #define PROT_WRITE	2