diff --git a/10.0/Dockerfile b/10.0/Dockerfile
index 6f03eb6..5aca72c 100644
--- a/10.0/Dockerfile
+++ b/10.0/Dockerfile
@@ -27,7 +27,7 @@ RUN set -x; \
 
 # install latest postgresql-client
 RUN set -x; \
-        echo 'deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main' > etc/apt/sources.list.d/pgdg.list \
+        echo 'deb http://apt.postgresql.org/pub/repos/apt/ jessie-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/11.0/Dockerfile b/11.0/Dockerfile
index 2854505..b51de7b 100644
--- a/11.0/Dockerfile
+++ b/11.0/Dockerfile
@@ -31,7 +31,7 @@ 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 1098831..26055e0 100644
--- a/12.0/Dockerfile
+++ b/12.0/Dockerfile
@@ -31,7 +31,7 @@ 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}" \