diff --git a/make/mkspec.sh b/make/mkspec.sh
index 65ca0064..5fd0bc0b 100644
--- a/make/mkspec.sh
+++ b/make/mkspec.sh
@@ -56,7 +56,7 @@ echo "%install"
 #echo 'mkdir -p $RPM_BUILD_ROOT/opt/ytools/lib'
 #echo 'mkdir -p $RPM_BUILD_ROOT/usr/share/doc/packages/ytools'
 #echo 'pwd'
-echo "export ENV_PREFIX=\$RPM_BUILD_ROOT"
+echo "export ENV_PREFIX=\$RPM_BUILD_ROOT/"
 echo "export INSTALL_LOG=$INSTALL_LOG"
 echo "rm -rf `dirname $INSTALL_LOG`"
 echo "mkdir -p `dirname $INSTALL_LOG`"