diff --git a/modules/blocks/postgresql.nix b/modules/blocks/postgresql.nix
index 9cfb0ab..ba7c667 100644
--- a/modules/blocks/postgresql.nix
+++ b/modules/blocks/postgresql.nix
@@ -134,7 +134,7 @@ in
         systemd.services.postgresql.postStart =
           let
             prefix = ''
-            $PSQL -tA <<'EOF'
+            psql -tA <<'EOF'
               DO $$
               DECLARE password TEXT;
               BEGIN
diff --git a/test/modules/postgresql.nix b/test/modules/postgresql.nix
index 02e60a6..3e35a91 100644
--- a/test/modules/postgresql.nix
+++ b/test/modules/postgresql.nix
@@ -104,7 +104,7 @@ in
         settings = commonSettings;
       };
       systemd.services.postgresql.postStart = ''
-      $PSQL -tA <<'EOF'
+      psql -tA <<'EOF'
         DO $$
         DECLARE password TEXT;
         BEGIN
@@ -190,7 +190,7 @@ in
         settings = commonSettings;
       };
       systemd.services.postgresql.postStart = ''
-      $PSQL -tA <<'EOF'
+      psql -tA <<'EOF'
         DO $$
         DECLARE password TEXT;
         BEGIN
@@ -243,7 +243,7 @@ in
         settings = commonSettings;
       };
       systemd.services.postgresql.postStart = ''
-      $PSQL -tA <<'EOF'
+      psql -tA <<'EOF'
         DO $$
         DECLARE password TEXT;
         BEGIN