diff --git a/third-party/miniupnp/Makefile.am b/third-party/miniupnp/Makefile.am
index e79a0d52d..46b209517 100644
--- a/third-party/miniupnp/Makefile.am
+++ b/third-party/miniupnp/Makefile.am
@@ -35,4 +35,6 @@ BUILT_SOURCES = \
     miniupnpcstrings.h
 
 miniupnpcstrings.h: Makefile
-	$(srcdir)/updateminiupnpcstrings.sh
+	$(srcdir)/updateminiupnpcstrings.sh $(srcdir)/miniupnpcstrings.h.in $(builddir)/miniupnpcstrings.h
+
+DISTCLEANFILES = $(builddir)/miniupnpcstrings.h
diff --git a/third-party/miniupnp/updateminiupnpcstrings.sh b/third-party/miniupnp/updateminiupnpcstrings.sh
index 7f05310ac..60d4a7ef9 100755
--- a/third-party/miniupnp/updateminiupnpcstrings.sh
+++ b/third-party/miniupnp/updateminiupnpcstrings.sh
@@ -1,7 +1,8 @@
 #! /bin/sh
 # $Id: updateminiupnpcstrings.sh,v 1.3 2009/07/09 16:13:31 nanard Exp $
 
-FILE=miniupnpcstrings.h
+TEMPLATE_FILE=$1
+OUTPUT_FILE=$2
 
 # detecting the OS name and version
 OS_NAME=`uname -s`
@@ -29,9 +30,9 @@ echo "Detected OS [$OS_NAME] version [$OS_VERSION]"
 
 EXPR="s/OS_STRING \".*\"/OS_STRING \"${OS_NAME}\/${OS_VERSION}\"/"
 #echo $EXPR
-#echo "Backuping $FILE to $FILE.bak."
-#cp $FILE $FILE.bak
-test -f ${FILE}.in
-echo "setting OS_STRING macro value to ${OS_NAME}/${OS_VERSION} in $FILE."
-cat ${FILE}.in | sed -e "$EXPR" > $FILE
+#echo "Backing up $OUTPUT_FILE to $OUTPUT_FILE.bak."
+#cp $OUTPUT_FILE $OUTPUT_FILE.bak
+test -f ${TEMPLATE_FILE}
+echo "setting OS_STRING macro value to ${OS_NAME}/${OS_VERSION} in $OUTPUT_FILE."
+cat ${TEMPLATE_FILE} | sed -e "$EXPR" > $OUTPUT_FILE