diff --git a/LH/createImages b/LH/createImages
index 01974607f971393436e5ebf08ee4d14070c03b5a..b236278b5ff74c1f6a585f297bd19e1a057e5d8d 100755
--- a/LH/createImages
+++ b/LH/createImages
@@ -79,7 +79,7 @@ dotPos[3]=${digitPos[3]}
 for ((FNb=1; FNb<=MAX_FILES; FNb++)); do
 
 value=""
-DPR=$((RANDOM % ($NUMBER_OF_DIGITS + 1))) # random dot position (0..$NUMBER_OF_DIGITS)
+DPR=$((RANDOM % ($NUMBER_OF_DIGITS))) # random dot position (0..$NUMBER_OF_DIGITS-1)
 for (( i=1; i<=$MAX_DIGITS; i++ )); do
   if (( $i == 4 )); then
     value+="-"