diff --git a/tools/ocaml/common.make b/tools/ocaml/common.make
index 708d74617c..cecfc5b6b8 100644
--- a/tools/ocaml/common.make
+++ b/tools/ocaml/common.make
@@ -14,7 +14,7 @@ CFLAGS += -fPIC -I$(shell ocamlc -where)
 OCAMLOPTFLAGS = -g -ccopt "$(LDFLAGS)" -dtypes $(OCAMLINCLUDE) -w F -warn-error F
 OCAMLCFLAGS += -g $(OCAMLINCLUDE) -w F -warn-error F
 
-VERSION := 4.1
+VERSION := $(shell $(XEN_ROOT)/version.sh $(XEN_ROOT)/xen/Makefile)
 
 OCAMLDESTDIR ?= $(DESTDIR)$(shell $(OCAMLFIND) printconf destdir)