diff --git a/src/Makefile.in b/src/Makefile.in
index 0d75221acfa..f473888cc5d 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -928,7 +928,7 @@ emacs${EXEEXT}: temacs${EXEEXT} ${etc}DOC ${lisp}
    for the first time, this prevents any variation between configurations
    in the contents of the DOC file.
    Likewise for ${SOME_MACHINE_LISP}.  */
-${etc}DOC: ${libsrc}make-docfile ${obj} ${shortlisp} ${SOME_MACHINE_LISP}
+${etc}DOC: ${libsrc}make-docfile${EXEEXT} ${obj} ${shortlisp} ${SOME_MACHINE_LISP}
 	-rm -f ${etc}DOC
 	${libsrc}make-docfile -d ${srcdir} ${SOME_MACHINE_OBJECTS} ${obj} > ${etc}DOC
 	${libsrc}make-docfile -a ${etc}DOC -d ${srcdir} ${SOME_MACHINE_LISP} ${shortlisp}