diff --git a/scripts/mkspec-wrapper.sh b/scripts/mkspec-wrapper.sh
index 4616d4a3..7e3d8f03 100644
--- a/scripts/mkspec-wrapper.sh
+++ b/scripts/mkspec-wrapper.sh
@@ -1,6 +1,8 @@
 #!/bin/sh -x
 
-INSTALL_LOG=/var/tmp/%{name}-buildroot/install.log
+if [ ! "$INSTALL_LOG" ]; then
+	INSTALL_LOG=/var/tmp/%{name}-buildroot/install.log
+fi
 MYNAME=`basename $0`
 MKSPEC_SH="$1"
 shift