diff --git a/reactos/lib/cmlib/cmlib.mak b/reactos/lib/cmlib/cmlib.mak
index 467cf66d844..e35e3ccc01c 100644
--- a/reactos/lib/cmlib/cmlib.mak
+++ b/reactos/lib/cmlib/cmlib.mak
@@ -31,7 +31,7 @@ CMLIB_HOST_OBJECTS = \
 	$(subst $(CMLIB_BASE), $(CMLIB_INT), $(CMLIB_HOST_SOURCES:.c=.o))
 
 CMLIB_HOST_CFLAGS = -O3 -Wall -Wwrite-strings -Wpointer-arith \
-  -D_X86_ -D__i386__ -D_REACTOS_ -D_NTOSKRNL_\
+  -D_X86_ -D__i386__ -D_REACTOS_ -D_NTOSKRNL_ -D_NTSYSTEM_ \
   -DCMLIB_HOST -D_M_IX86 -I$(CMLIB_BASE) -Iinclude/reactos -Iinclude/psdk -Iinclude/ddk -Iinclude/crt \
   -D__NO_CTYPE_INLINES
 
diff --git a/reactos/tools/mkhive/mkhive.mak b/reactos/tools/mkhive/mkhive.mak
index 252bc80f7d9..4cbc4d11645 100644
--- a/reactos/tools/mkhive/mkhive.mak
+++ b/reactos/tools/mkhive/mkhive.mak
@@ -31,7 +31,7 @@ MKHIVE_OBJECTS = \
 	$(addprefix $(INTERMEDIATE_), $(MKHIVE_SOURCES:.c=.o))
 
 MKHIVE_HOST_CFLAGS = -fshort-wchar $(xTOOLS_CFLAGS) -I$(INFLIB_BASE) -I$(CMLIB_BASE) \
-  -D_NTOSKRNL_ \
+  -D_NTOSKRNL_ -D_NTSYSTEM_ \
   -Iinclude/reactos -Iinclude/ddk -Iinclude/ndk -Iinclude/psdk -Iinclude -Iinclude/crt -g3
 
 MKHIVE_HOST_LFLAGS = $(xTOOLS_LFLAGS) -g3