diff --git a/gaboshlib/g_percentage-diff.bashfunc b/gaboshlib/g_percentage-diff.bashfunc
index a09afbf..973ca35 100644
--- a/gaboshlib/g_percentage-diff.bashfunc
+++ b/gaboshlib/g_percentage-diff.bashfunc
@@ -3,6 +3,7 @@
 function g_percentage-diff {
   local g_from=$1
   local g_to=$2
+  unset g_percentage_diff_result
   g_num_valid_number "$g_from" "$g_to" || return 1
   g_calc "${g_from} == 0"
   [ ${g_calc_result} -eq 1 ] && return 1