diff --git a/AT5/txt2corpus.sh b/AT5/txt2corpus.sh
index 0534355..a781cc9 100755
--- a/AT5/txt2corpus.sh
+++ b/AT5/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 cd ../..
diff --git a/GG/txt2corpus.sh b/GG/txt2corpus.sh
index 25cf7d4..8576e04 100755
--- a/GG/txt2corpus.sh
+++ b/GG/txt2corpus.sh
@@ -54,6 +54,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 cd ../..
diff --git a/NOS/txt2corpus.sh b/NOS/txt2corpus.sh
index 7e58cb2..65d41c6 100755
--- a/NOS/txt2corpus.sh
+++ b/NOS/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/NU/txt2corpus.sh b/NU/txt2corpus.sh
index 0e21291..5f8ae5d 100755
--- a/NU/txt2corpus.sh
+++ b/NU/txt2corpus.sh
@@ -54,6 +54,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/NieuwsNL/txt2corpus.sh b/NieuwsNL/txt2corpus.sh
index 193c969..61c0b11 100755
--- a/NieuwsNL/txt2corpus.sh
+++ b/NieuwsNL/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/Oog/txt2corpus.sh b/Oog/txt2corpus.sh
index 083e049..6cba832 100755
--- a/Oog/txt2corpus.sh
+++ b/Oog/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/RO/txt2corpus.sh b/RO/txt2corpus.sh
index afb4331..a4b0545 100755
--- a/RO/txt2corpus.sh
+++ b/RO/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/RTVNoord/txt2corpus.sh b/RTVNoord/txt2corpus.sh
index c2ade29..138fccf 100755
--- a/RTVNoord/txt2corpus.sh
+++ b/RTVNoord/txt2corpus.sh
@@ -54,6 +54,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/Sargasso/txt2corpus.sh b/Sargasso/txt2corpus.sh
index 5391ce4..a89b861 100755
--- a/Sargasso/txt2corpus.sh
+++ b/Sargasso/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/Sikkom/txt2corpus.sh b/Sikkom/txt2corpus.sh
index d18b92d..d2df7be 100755
--- a/Sikkom/txt2corpus.sh
+++ b/Sikkom/txt2corpus.sh
@@ -54,6 +54,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 cd ../..
diff --git a/Tzum/txt2corpus.sh b/Tzum/txt2corpus.sh
index 1bd4d6d..a69971a 100755
--- a/Tzum/txt2corpus.sh
+++ b/Tzum/txt2corpus.sh
@@ -56,6 +56,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin
diff --git a/VRT/txt2corpus.sh b/VRT/txt2corpus.sh
index 1b55734..3c82ead 100755
--- a/VRT/txt2corpus.sh
+++ b/VRT/txt2corpus.sh
@@ -54,6 +54,7 @@ Alpino -flag treebank xml debug=1 end_hook=xml user_max=900000 -parse < $corpus.
 ../../../metadata
 
 cd xml
+rm -f $corpus.data.dz $corpus.index
 alto -o $corpus.data.dz *.xml 2> /dev/null
 
 # telling per bericht, niet per zin