diff --git a/bin/install-site-core.sh b/bin/install-site-core.sh
index c821142..a7a7271 100755
--- a/bin/install-site-core.sh
+++ b/bin/install-site-core.sh
@@ -175,5 +175,5 @@ update_apt_sources
 # Remove one crippling package, if it's installed:
 apt-get -qq remove -y --purge apt-xapian-index >/dev/null || true
 clone_or_update_repository
-chown -R "$UNIX_USER"."$UNIX_USER" "$DIRECTORY"
+chown -R "$UNIX_USER":"$UNIX_USER" "$DIRECTORY"
 run_site_specific_script
diff --git a/bin/install-site.sh b/bin/install-site.sh
index 8acb655..7332d6e 100755
--- a/bin/install-site.sh
+++ b/bin/install-site.sh
@@ -336,7 +336,7 @@ install_postgis() {
 make_log_directory() {
     LOG_DIRECTORY="$DIRECTORY/logs"
     mkdir -p "$LOG_DIRECTORY"
-    chown -R "$UNIX_USER"."$UNIX_USER" "$LOG_DIRECTORY"
+    chown -R "$UNIX_USER":"$UNIX_USER" "$LOG_DIRECTORY"
 }
 
 add_website_to_nginx() {
@@ -668,5 +668,5 @@ update_apt_sources
 # Remove one crippling package, if it's installed:
 apt-get -qq remove -y --purge apt-xapian-index >/dev/null || true
 clone_or_update_repository
-chown -R "$UNIX_USER"."$UNIX_USER" "$DIRECTORY"
+chown -R "$UNIX_USER":"$UNIX_USER" "$DIRECTORY"
 run_site_specific_script
diff --git a/shlib/installfns b/shlib/installfns
index b4805b9..cf11af8 100755
--- a/shlib/installfns
+++ b/shlib/installfns
@@ -336,7 +336,7 @@ install_postgis() {
 make_log_directory() {
     LOG_DIRECTORY="$DIRECTORY/logs"
     mkdir -p "$LOG_DIRECTORY"
-    chown -R "$UNIX_USER"."$UNIX_USER" "$LOG_DIRECTORY"
+    chown -R "$UNIX_USER":"$UNIX_USER" "$LOG_DIRECTORY"
 }
 
 add_website_to_nginx() {