diff --git a/pywal/__main__.py b/pywal/__main__.py
index de302d6..460d77b 100644
--- a/pywal/__main__.py
+++ b/pywal/__main__.py
@@ -117,7 +117,7 @@ def process_args(args):
         reload.env()
 
     if args.o:
-        util.disown(args.o)
+        util.disown([args.o])
 
 
 def main():
diff --git a/pywal/reload.py b/pywal/reload.py
index 3e7a6c3..56c2c8e 100644
--- a/pywal/reload.py
+++ b/pywal/reload.py
@@ -15,9 +15,9 @@ def xrdb(xrdb_file=None):
     xrdb_file = xrdb_file or CACHE_DIR / "colors.Xresources"
 
     if shutil.which("xrdb"):
-        subprocess.call(["xrdb", "-merge", xrdb_file],
-                        stdout=subprocess.DEVNULL,
-                        stderr=subprocess.DEVNULL)
+        subprocess.Popen(["xrdb", "-merge", xrdb_file],
+                         stdout=subprocess.DEVNULL,
+                         stderr=subprocess.DEVNULL).wait()
 
 
 def gtk():
@@ -33,7 +33,8 @@ def gtk():
         # This is done because the Python 3 GTK/Gdk libraries don't
         # provide a way of doing this.
         if shutil.which("python2"):
-            util.disown("python2", MODULE_DIR / "scripts" / "gtk_reload.py")
+            util.disown(["python2", MODULE_DIR / "scripts" / "gtk_reload.py"])
+
         else:
             print("warning: GTK2 reload support requires Python 2.")
 
@@ -41,7 +42,7 @@ def gtk():
 def i3():
     """Reload i3 colors."""
     if shutil.which("i3-msg"):
-        util.disown("i3-msg", "reload")
+        util.disown(["i3-msg", "reload"])
 
 
 def polybar():
diff --git a/pywal/scripts/gtk_reload.py b/pywal/scripts/gtk_reload.py
index e17b93b..ffb267d 100644
--- a/pywal/scripts/gtk_reload.py
+++ b/pywal/scripts/gtk_reload.py
@@ -10,7 +10,7 @@ Original source: https://crunchbang.org/forums/viewtopic.php?id=39646
 try:
     import gtk
 except ImportError:
-    print("[!] error: GTK reload requires PyGTK.")
+    print("error: GTK reload requires PyGTK.")
     exit(1)
 
 
diff --git a/pywal/sequences.py b/pywal/sequences.py
index cf5aae7..bbe7c72 100644
--- a/pywal/sequences.py
+++ b/pywal/sequences.py
@@ -69,4 +69,4 @@ def send(colors, vte, cache_dir=CACHE_DIR):
         util.save_file(sequences, term)
 
     util.save_file(sequences, cache_dir / "sequences")
-    print("colors: Set terminal colors")
+    print("colors: Set terminal colors.")
diff --git a/pywal/util.py b/pywal/util.py
index 2f86811..2f5debc 100644
--- a/pywal/util.py
+++ b/pywal/util.py
@@ -119,10 +119,10 @@ def darken_color(color, darkness):
     return rgb_to_hex([int(col * (1 - darkness)) for col in hex_to_rgb(color)])
 
 
-def disown(*cmd):
+def disown(cmd):
     """Call a system command in the background,
        disown it and hide it's output."""
-    subprocess.Popen(["nohup"] + list(cmd),
+    subprocess.Popen(["nohup", *cmd],
                      stdout=subprocess.DEVNULL,
                      stderr=subprocess.DEVNULL,
                      preexec_fn=os.setpgrp)
@@ -132,6 +132,6 @@ def msg(input_msg, notify):
     """Print to the terminal and display a libnotify
        notification."""
     if notify:
-        disown("notify-send", input_msg)
+        disown(["notify-send", input_msg])
 
     print(input_msg)
diff --git a/pywal/wallpaper.py b/pywal/wallpaper.py
index 05f5d08..dae0f24 100644
--- a/pywal/wallpaper.py
+++ b/pywal/wallpaper.py
@@ -28,26 +28,26 @@ def get_desktop_env():
 
 def xfconf(path, img):
     """Call xfconf to set the wallpaper on XFCE."""
-    util.disown("xfconf-query", "--channel", "xfce4-desktop",
-                "--property", path, "--set", img)
+    util.disown(["xfconf-query", "--channel", "xfce4-desktop",
+                 "--property", path, "--set", img])
 
 
 def set_wm_wallpaper(img):
     """Set the wallpaper for non desktop environments."""
     if shutil.which("feh"):
-        subprocess.Popen(["feh", "--bg-fill", img])
+        util.disown(["feh", "--bg-fill", img])
 
     elif shutil.which("nitrogen"):
-        subprocess.Popen(["nitrogen", "--set-zoom-fill", img])
+        util.disown(["nitrogen", "--set-zoom-fill", img])
 
     elif shutil.which("bgs"):
-        subprocess.Popen(["bgs", img])
+        util.disown(["bgs", img])
 
     elif shutil.which("hsetroot"):
-        subprocess.Popen(["hsetroot", "-fill", img])
+        util.disown(["hsetroot", "-fill", img])
 
     elif shutil.which("habak"):
-        subprocess.Popen(["habak", "-mS", img])
+        util.disown(["habak", "-mS", img])
 
     else:
         print("error: No wallpaper setter found.")
@@ -64,18 +64,18 @@ def set_desktop_wallpaper(desktop, img):
         xfconf("/backdrop/screen0/monitor0/workspace0/last-image", img)
 
     elif "muffin" in desktop or "cinnamon" in desktop:
-        subprocess.Popen(["gsettings", "set",
-                          "org.cinnamon.desktop.background",
-                          "picture-uri", "file://" + img])
+        util.disown(["gsettings", "set",
+                     "org.cinnamon.desktop.background",
+                     "picture-uri", "file://" + img])
 
     elif "gnome" in desktop:
-        subprocess.Popen(["gsettings", "set",
-                          "org.gnome.desktop.background",
-                          "picture-uri", "file://" + img])
+        util.disown(["gsettings", "set",
+                     "org.gnome.desktop.background",
+                     "picture-uri", "file://" + img])
 
     elif "mate" in desktop:
-        subprocess.Popen(["gsettings", "set", "org.mate.background",
-                          "picture-filename", img])
+        util.disown(["gsettings", "set", "org.mate.background",
+                     "picture-filename", img])
 
     else:
         set_wm_wallpaper(img)
@@ -86,8 +86,11 @@ def set_mac_wallpaper(img):
     db_file = HOME / "Library/Application Support/Dock/desktoppicture.db"
     subprocess.call(["sqlite3", db_file, f"update data set value = '{img}'"])
 
-    # Kill the dock to fix issues with wallpapers sharing names.
-    util.disown("killall", "Dock")
+    # Kill the dock to fix issues with cached wallpapers.
+    # macOS caches wallpapers and if a wallpaper is set that shares
+    # the filename with a cached wallpaper, the cached wallpaper is
+    # used instead.
+    util.disown(["killall", "Dock"])
 
 
 def change(img):
@@ -106,7 +109,7 @@ def change(img):
     else:
         set_wm_wallpaper(img)
 
-    print("wallpaper: Set the new wallpaper")
+    print("wallpaper: Set the new wallpaper.")
 
 
 def get(cache_dir=CACHE_DIR):