diff --git a/builder/dockerfile.alpine_319.apk.build b/builder/dockerfile.alpine_319.apk.build
index 35e0dc7..ae0f4e8 100644
--- a/builder/dockerfile.alpine_319.apk.build
+++ b/builder/dockerfile.alpine_319.apk.build
@@ -10,7 +10,6 @@ WORKDIR $HOME/kasmvncserver
 
 ARG KASMVNC_ALPINE_PRIVATE_KEY
 ARG KASMVNC_ALPINE_PUBLIC_KEY
-ENV APK_KEYS_DIR=/etc/apk/keys
 
 ENV SCRIPTS_DIR=/tmp/scripts
 COPY builder/scripts $SCRIPTS_DIR
diff --git a/builder/scripts/install_alpine_signing_keys b/builder/scripts/install_alpine_signing_keys
index 0fbe3da..63c3630 100755
--- a/builder/scripts/install_alpine_signing_keys
+++ b/builder/scripts/install_alpine_signing_keys
@@ -20,6 +20,7 @@ install_public_signing_key() {
   fi
 }
 
+APK_KEYS_DIR=/etc/apk/keys
 BEGIN_PRIVATE_KEY='-----BEGIN PRIVATE KEY-----'
 END_PRIVATE_KEY='-----END PRIVATE KEY-----'
 BEGIN_PUBLIC_KEY='-----BEGIN PUBLIC KEY-----'