diff --git a/build/deb_rpm/v2-jf/build-scripts/rpm-sign.sh b/build/deb_rpm/v2-jf/build-scripts/rpm-sign.sh
index 1b74498e5..05bb219a2 100755
--- a/build/deb_rpm/v2-jf/build-scripts/rpm-sign.sh
+++ b/build/deb_rpm/v2-jf/build-scripts/rpm-sign.sh
@@ -29,8 +29,10 @@ rpmInitSigning(){
     eval "$gpg_agent_output"
 
     # Set GPG_TTY if possible
+    local tty_value
     if tty -s; then
-        export GPG_TTY=$(tty)
+        tty_value=$(tty)
+        export GPG_TTY="$tty_value"
     else
         export GPG_TTY="/dev/null"
     fi
diff --git a/build/deb_rpm/v2/build-scripts/rpm-sign.sh b/build/deb_rpm/v2/build-scripts/rpm-sign.sh
index 1b74498e5..05bb219a2 100755
--- a/build/deb_rpm/v2/build-scripts/rpm-sign.sh
+++ b/build/deb_rpm/v2/build-scripts/rpm-sign.sh
@@ -29,8 +29,10 @@ rpmInitSigning(){
     eval "$gpg_agent_output"
 
     # Set GPG_TTY if possible
+    local tty_value
     if tty -s; then
-        export GPG_TTY=$(tty)
+        tty_value=$(tty)
+        export GPG_TTY="$tty_value"
     else
         export GPG_TTY="/dev/null"
     fi