diff --git a/modules/services/redshift-gammastep/lib/options.nix b/modules/services/redshift-gammastep/lib/options.nix
index 436dfc173..b0bee325d 100644
--- a/modules/services/redshift-gammastep/lib/options.nix
+++ b/modules/services/redshift-gammastep/lib/options.nix
@@ -239,7 +239,7 @@ in
             configFullPath = config.xdg.configHome + "/${xdgConfigFilePath}";
           in
           "${cfg.package}/bin/${command} "
-          + lib.cli.toGNUCommandLineShell { } {
+          + lib.cli.toCommandLineShellGNU { } {
             v = cfg.enableVerboseLogging;
             c = configFullPath;
           };
diff --git a/tests/modules/services/redshift-gammastep/gammastep-basic-configuration-expected.service b/tests/modules/services/redshift-gammastep/gammastep-basic-configuration-expected.service
index a877b60f8..1762ad527 100644
--- a/tests/modules/services/redshift-gammastep/gammastep-basic-configuration-expected.service
+++ b/tests/modules/services/redshift-gammastep/gammastep-basic-configuration-expected.service
@@ -2,7 +2,7 @@
 WantedBy=graphical-session.target
 
 [Service]
-ExecStart=@gammastep@/bin/gammastep -c /home/hm-user/.config/gammastep/config.ini
+ExecStart=@gammastep@/bin/gammastep -c/home/hm-user/.config/gammastep/config.ini
 Restart=on-failure
 RestartSec=3
 
diff --git a/tests/modules/services/redshift-gammastep/gammastep-tray-configuration-expected.service b/tests/modules/services/redshift-gammastep/gammastep-tray-configuration-expected.service
index fde728ded..530d18dad 100644
--- a/tests/modules/services/redshift-gammastep/gammastep-tray-configuration-expected.service
+++ b/tests/modules/services/redshift-gammastep/gammastep-tray-configuration-expected.service
@@ -2,7 +2,7 @@
 WantedBy=graphical-session.target
 
 [Service]
-ExecStart=@gammastep@/bin/gammastep-indicator -c /home/hm-user/.config/gammastep/config.ini
+ExecStart=@gammastep@/bin/gammastep-indicator -c/home/hm-user/.config/gammastep/config.ini
 Restart=on-failure
 RestartSec=3
 
diff --git a/tests/modules/services/redshift-gammastep/redshift-basic-configuration-expected.service b/tests/modules/services/redshift-gammastep/redshift-basic-configuration-expected.service
index 7177fab8f..62ec0b328 100644
--- a/tests/modules/services/redshift-gammastep/redshift-basic-configuration-expected.service
+++ b/tests/modules/services/redshift-gammastep/redshift-basic-configuration-expected.service
@@ -2,7 +2,7 @@
 WantedBy=graphical-session.target
 
 [Service]
-ExecStart=@redshift@/bin/redshift -c /home/hm-user/.config/redshift/redshift.conf
+ExecStart=@redshift@/bin/redshift -c/home/hm-user/.config/redshift/redshift.conf
 Restart=on-failure
 RestartSec=3
 
diff --git a/tests/modules/services/redshift-gammastep/redshift-tray-configuration-expected.service b/tests/modules/services/redshift-gammastep/redshift-tray-configuration-expected.service
index db4b11c3b..d438b8aae 100644
--- a/tests/modules/services/redshift-gammastep/redshift-tray-configuration-expected.service
+++ b/tests/modules/services/redshift-gammastep/redshift-tray-configuration-expected.service
@@ -2,7 +2,7 @@
 WantedBy=graphical-session.target
 
 [Service]
-ExecStart=@redshift@/bin/redshift-gtk -c /home/hm-user/.config/redshift/redshift.conf
+ExecStart=@redshift@/bin/redshift-gtk -c/home/hm-user/.config/redshift/redshift.conf
 Restart=on-failure
 RestartSec=3