diff --git a/bin/lib/format.nix b/bin/lib/format.nix
index eadd123722d1b940448560d8449063ec519a0745..788277b7584577dbb668c23099192fa46857f905 100644
--- a/bin/lib/format.nix
+++ b/bin/lib/format.nix
@@ -47,23 +47,6 @@ assert (typeOf swap) == "string";
       print "Usage: $cmdname <CONFIG_FILE> <OUTPUT_FILE>" >&2
     }
 
-    print_info() {
-      if [[ $# -ge 1 ]]
-      then
-        print -P "%B%F{blue}$1%b%f" >&2
-      else
-        print >&2
-      fi
-    }
-
-    print_warning() {
-      print -P "%B%F{yellow}$1%b%f" >&2
-    }
-
-    print_error() {
-      print -P "%B%F{red}$1%b%f" >&2
-    }
-
     if [ "$1" = "--help" -o "$1" = "-h" ]
     then
         usage
diff --git a/bin/lib/util.zsh b/bin/lib/util.zsh
index ef03cdf45563d05c602ec7b9843b9963ef24f9b9..120d950eeae5ef95c10a897908b43e84f47b014f 100644
--- a/bin/lib/util.zsh
+++ b/bin/lib/util.zsh
@@ -1,11 +1,26 @@
 print_info() {
-  print -P "%B%F{blue}$1%b%f" >&2
+  if [[ $# -ge 1 ]]
+  then
+    print -P "%B%F{blue}$1%b%f" >&2
+  else
+    print >&2
+  fi
 }
 
 print_warning() {
-  print -P "%B%F{yellow}$1%b%f" >&2
+  if [[ $# -ge 1 ]]
+  then
+    print -P "%B%F{yellow}$1%b%f" >&2
+  else
+    print >&2
+  fi
 }
 
 print_error() {
-  print -P "%B%F{red}$1%b%f" >&2
+  if [[ $# -ge 1 ]]
+  then
+    print -P "%B%F{red}$1%b%f" >&2
+  else
+    print >&2
+  fi
 }