diff --git a/tangle-all.sh b/tangle-all.sh
index 7c8848e1..ffa371a8 100755
--- a/tangle-all.sh
+++ b/tangle-all.sh
@@ -6,6 +6,7 @@ FILES="src/index.org"
 for m in $MODULES; do
     MODULE="geom-$m"
     SRC="$MODULE/src/*.org $MODULE/test/*.org $MODULE/bench/*.org"
+    rm -rf $MODULE/babel/src $MODULE/babel/test
     for f in `ls $SRC`; do
         FILES="$FILES $f"
     done
diff --git a/tangle-module.sh b/tangle-module.sh
index 4a129b4a..1ad65de5 100755
--- a/tangle-module.sh
+++ b/tangle-module.sh
@@ -4,6 +4,8 @@ DIR=`pwd`
 FILES=""
 SRC="geom-$1/src/*.org geom-$1/test/*.org geom-$1/bench/*.org"
 
+rm -rf geom-$1/babel/src geom-$1/babel/test
+
 # wrap each argument in the code required to call tangle on it
 for i in `ls $SRC`; do
     FILES="$FILES \"$i\""