diff --git a/11.0/Dockerfile b/11.0/Dockerfile
index 31b58c6..ece4776 100644
--- a/11.0/Dockerfile
+++ b/11.0/Dockerfile
@@ -36,7 +36,7 @@ RUN set -x; \
 
 # install latest postgresql-client
 RUN set -x; \
-        echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > etc/apt/sources.list.d/pgdg.list \
+        echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc/apt/sources.list.d/pgdg.list \
         && export GNUPGHOME="$(mktemp -d)" \
         && repokey='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8' \
         && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "${repokey}" \
diff --git a/12.0/Dockerfile b/12.0/Dockerfile
index d375a06..7b00d8e 100644
--- a/12.0/Dockerfile
+++ b/12.0/Dockerfile
@@ -36,7 +36,7 @@ RUN set -x; \
 
 # install latest postgresql-client
 RUN set -x; \
-        echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > etc/apt/sources.list.d/pgdg.list \
+        echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc/apt/sources.list.d/pgdg.list \
         && export GNUPGHOME="$(mktemp -d)" \
         && repokey='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8' \
         && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "${repokey}" \
diff --git a/13.0/Dockerfile b/13.0/Dockerfile
index f99aab5..18b3c8f 100644
--- a/13.0/Dockerfile
+++ b/13.0/Dockerfile
@@ -34,7 +34,7 @@ RUN set -x; \
 
 # install latest postgresql-client
 RUN set -x; \
-        echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' > etc/apt/sources.list.d/pgdg.list \
+        echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' > /etc/apt/sources.list.d/pgdg.list \
         && export GNUPGHOME="$(mktemp -d)" \
         && repokey='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8' \
         && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "${repokey}" \