diff --git a/reactos/subsys/system/explorer/makefile_rex b/reactos/subsys/system/explorer/makefile_rex
index 8db2b082e19..68c6d837018 100644
--- a/reactos/subsys/system/explorer/makefile_rex
+++ b/reactos/subsys/system/explorer/makefile_rex
@@ -42,7 +42,7 @@ all: buildno.h explorer.exe
 	@strip explorer.exe
 
 buildno.h: ../../../include/reactos/buildno.h
-	cp ../../../include/reactos/buildno.h $@
+	./updatebuildno
 
 TARGET_SDKLIBS = \
 	kernel32.a \
diff --git a/reactos/subsys/system/explorer/updatebuildno b/reactos/subsys/system/explorer/updatebuildno
new file mode 100755
index 00000000000..51475079856
--- /dev/null
+++ b/reactos/subsys/system/explorer/updatebuildno
@@ -0,0 +1 @@
+cp ../../../include/reactos/buildno.h .
diff --git a/reactos/subsys/system/explorer/updatebuildno.bat b/reactos/subsys/system/explorer/updatebuildno.bat
new file mode 100644
index 00000000000..871eef062ba
--- /dev/null
+++ b/reactos/subsys/system/explorer/updatebuildno.bat
@@ -0,0 +1 @@
+copy /y ..\..\..\include\reactos\buildno.h . >nul