diff --git a/zsh-syntax-highlighting.zsh b/zsh-syntax-highlighting.zsh
index 0251d1e..31220d7 100644
--- a/zsh-syntax-highlighting.zsh
+++ b/zsh-syntax-highlighting.zsh
@@ -1,3 +1,4 @@
+() { # that's here to make the line numbers in errors match the file line numbers.
 # -------------------------------------------------------------------------------------------------
 # Copyright (c) 2010-2016 zsh-syntax-highlighting contributors
 # All rights reserved.
@@ -28,13 +29,15 @@
 # -------------------------------------------------------------------------------------------------
 
 # First of all, ensure predictable parsing.
-zsh_highlight__aliases=`builtin alias -Lm '[^+]*'`
+local zsh_highlight__aliases="`builtin alias -Lm '[^+]*'`"
 # In zsh <= 5.2, `alias -L` emits aliases that begin with a plus sign ('alias -- +foo=42')
 # them without a '--' guard, so they don't round trip.
 #
 # Hence, we exclude them from unaliasing:
 builtin unalias -m '[^+]*'
 
+setopt localoptions warncreateglobal
+
 # Set $0 to the expected value, regardless of functionargzero.
 0=${(%):-%N}
 if true; then
@@ -405,3 +408,6 @@ builtin unset zsh_highlight__aliases
 
 # Set $?.
 true
+
+# End anonymous function
+}