diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 9138f4c9..644e0de0 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -29,7 +29,7 @@ RUN set -x \
     done; \
     test -z "$found" && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY" && exit 1; \
     done; \
-    gpg1 --export "$NGINX_GPGKEYS" > "$NGINX_GPGKEY_PATH" ; \
+    gpg1 --export $NGINX_GPGKEYS > "$NGINX_GPGKEY_PATH" ; \
     rm -rf "$GNUPGHOME"; \
     apt-get remove --purge --auto-remove -y gnupg1 && rm -rf /var/lib/apt/lists/* \
     && dpkgArch="$(dpkg --print-architecture)" \
diff --git a/mainline/debian/Dockerfile b/mainline/debian/Dockerfile
index 9e9f0ce4..84b47aef 100644
--- a/mainline/debian/Dockerfile
+++ b/mainline/debian/Dockerfile
@@ -34,7 +34,7 @@ RUN set -x \
     done; \
     test -z "$found" && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY" && exit 1; \
     done; \
-    gpg1 --export "$NGINX_GPGKEYS" > "$NGINX_GPGKEY_PATH" ; \
+    gpg1 --export $NGINX_GPGKEYS > "$NGINX_GPGKEY_PATH" ; \
     rm -rf "$GNUPGHOME"; \
     apt-get remove --purge --auto-remove -y gnupg1 && rm -rf /var/lib/apt/lists/* \
     && dpkgArch="$(dpkg --print-architecture)" \
diff --git a/stable/debian/Dockerfile b/stable/debian/Dockerfile
index d0b7cf62..447f10ec 100644
--- a/stable/debian/Dockerfile
+++ b/stable/debian/Dockerfile
@@ -34,7 +34,7 @@ RUN set -x \
     done; \
     test -z "$found" && echo >&2 "error: failed to fetch GPG key $NGINX_GPGKEY" && exit 1; \
     done; \
-    gpg1 --export "$NGINX_GPGKEYS" > "$NGINX_GPGKEY_PATH" ; \
+    gpg1 --export $NGINX_GPGKEYS > "$NGINX_GPGKEY_PATH" ; \
     rm -rf "$GNUPGHOME"; \
     apt-get remove --purge --auto-remove -y gnupg1 && rm -rf /var/lib/apt/lists/* \
     && dpkgArch="$(dpkg --print-architecture)" \