diff --git a/packages/audio/espeak-ng/package.mk b/packages/audio/espeak-ng/package.mk
index c3d26b93bc..8b312c97d5 100644
--- a/packages/audio/espeak-ng/package.mk
+++ b/packages/audio/espeak-ng/package.mk
@@ -6,7 +6,7 @@ PKG_VERSION="1.50"
 PKG_SHA256="80ee6cd06fcd61888951ab49362b400e80dd1fac352a8b1131d90cfe8a210edb"
 PKG_LICENSE="GPL"
 PKG_SITE="https://github.com/espeak-ng/espeak-ng"
-PKG_URL="https://github.com/espeak-ng/espeak-ng/releases/download/$PKG_VERSION/$PKG_NAME-$PKG_VERSION.tgz"
+PKG_URL="https://github.com/espeak-ng/espeak-ng/releases/download/${PKG_VERSION}/${PKG_NAME}-${PKG_VERSION}.tgz"
 PKG_DEPENDS_HOST="gcc:host "
 PKG_DEPENDS_TARGET="toolchain espeak-ng:host"
 PKG_LONGDESC="eSpeak NG is an open source speech synthesizer that supports more than a hundred languages and accents"
@@ -28,8 +28,8 @@ make_target() {
 
 makeinstall_target() {
   make src/espeak-ng src/speak-ng
-  make install-exec DESTDIR=$INSTALL
-  mkdir -p $INSTALL/usr/share/espeak-ng-data
-  cp -prf $TOOLCHAIN/share/espeak-ng-data $INSTALL/usr/share
+  make install-exec DESTDIR=${INSTALL}
+  mkdir -p ${INSTALL}/usr/share/espeak-ng-data
+  cp -prf ${TOOLCHAIN}/share/espeak-ng-data ${INSTALL}/usr/share
 }