diff --git a/captcha/captcha.sh b/captcha/captcha.sh
index c2aab5e..3efe84c 100755
--- a/captcha/captcha.sh
+++ b/captcha/captcha.sh
@@ -17,8 +17,6 @@ INPUT=$1
 
 TRANSFORMATIONS=(INTRUS SOMME)
 
-FILENAME="/var/tmp/captcha/$(date "+%Y-%m-%d-%H%M").png"
-
 if test -n ${BASH_VERSION:-''} ; then
     get_random ()
     {  
@@ -133,7 +131,7 @@ convert -size 300x60 xc:none -pointsize 20 \
 	-roll +$ROLL_X+0 \
 	-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
 	-roll -$ROLL_X+0 \) \
-	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:$FILENAME
+	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/tmp/captcha/$(date "+%Y-%m-%d-%H%M").png"
 
 convert -size 300x60 xc:none -pointsize 20 \
 	\( -clone 0 -fill black \
diff --git a/captcha/experimental.sh b/captcha/experimental.sh
index c2aab5e..3efe84c 100755
--- a/captcha/experimental.sh
+++ b/captcha/experimental.sh
@@ -17,8 +17,6 @@ INPUT=$1
 
 TRANSFORMATIONS=(INTRUS SOMME)
 
-FILENAME="/var/tmp/captcha/$(date "+%Y-%m-%d-%H%M").png"
-
 if test -n ${BASH_VERSION:-''} ; then
     get_random ()
     {  
@@ -133,7 +131,7 @@ convert -size 300x60 xc:none -pointsize 20 \
 	-roll +$ROLL_X+0 \
 	-wave "$WAVE1_AMPLITUDE"x"$WAVE1_LENGTH" \
 	-roll -$ROLL_X+0 \) \
-	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:$FILENAME
+	-flatten -crop 300x60 +repage -quality 500 -depth 11 png:"/var/tmp/captcha/$(date "+%Y-%m-%d-%H%M").png"
 
 convert -size 300x60 xc:none -pointsize 20 \
 	\( -clone 0 -fill black \