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-rw-r--r--Functions/Misc/zcalc4
1 files changed, 3 insertions, 1 deletions
diff --git a/Functions/Misc/zcalc b/Functions/Misc/zcalc
index 17700e48b..857007a94 100644
--- a/Functions/Misc/zcalc
+++ b/Functions/Misc/zcalc
@@ -114,7 +114,9 @@ forms=( '%2$g' '%.*g' '%.*f' '%.*E' '')
 zmodload -i zsh/mathfunc 2>/dev/null
 autoload -Uz zmathfuncdef
 
-: ${ZCALCPROMPT="%1v> "}
+if (( ! ${+ZCALCPROMPT} )); then
+  typeset -g ZCALCPROMPT="%1v> "
+fi
 
 # Supply some constants.
 float PI E