diff --git a/lesions_0.1 b/lesions_0.1
index 18efd9f33a990596cf22e7929f03e1f9c2b45c1f..af7f40cba62e2fc18ecf99fc571912afdee3b05a 100755
--- a/lesions_0.1
+++ b/lesions_0.1
@@ -14,7 +14,7 @@
 if [ _${2} = _ ] ; then
     echo "Usage:  lesions <t1_root> <t2_root> [-f]"
     echo "-f   :  second image is FLAIR not t2"
-    exit
+    exit 1
 fi
 
 nclasses=3
diff --git a/lesions_0.2 b/lesions_0.2
index 831e8a4b9d605bd23bb28b906cd54ba32bdb4145..88aa1aa66e7af48b187169ca554f84e4074de04c 100755
--- a/lesions_0.2
+++ b/lesions_0.2
@@ -15,7 +15,7 @@ if [ _$2 = _ ] ; then
     echo "Usage:  lesions <t1_root> <t2_root> [-f] [-lt <thr>]"
     echo "-f        :  second image is FLAIR not T2"
     echo "-lt <thr> :  set lesion threshold (default 0.5)"
-    exit
+    exit 1
 fi
 
 A=$1
diff --git a/lesions_0.3 b/lesions_0.3
index 8d42391a50f7d86b45b1dff839e62617f22856db..09abe2b3861a63db80427a91b4410469be764731 100644
--- a/lesions_0.3
+++ b/lesions_0.3
@@ -16,7 +16,7 @@ if [ _$2 = _ ] ; then
     echo "Usage:  lesions <t1_root> <t2_root> [-f] [-lt <thr>]"
     echo "-f        :  second image is FLAIR not T2"
     echo "-lt <thr> :  set lesion threshold (default 0.5)"
-    exit
+    exit 1
 fi
 
 A=$1
diff --git a/siena b/siena
index a2f30bb2349645305e500771cd1e3f1d4e7a352c..2bd80c6500c234fffd4fbf8186dda2a80d5919d4 100755
--- a/siena
+++ b/siena
@@ -21,7 +21,7 @@ Usage() {
     echo "-b <b>                : ignore from b (mm) downwards in MNI152/Talairach space; b should probably be -ve"
     echo "-S \"sienadiffopts\"    : options to pass to siena_diff timepoint differencing (inside double-quotes), e.g. -S \"-s -i 20\""
     echo ""
-    exit
+    exit 1
 }
 
 if [ _$FSLDIR = _ ] ; then
diff --git a/siena_flow2std b/siena_flow2std
index e266b2cfe87134b4e5787d179e1379a0eca6a6ce..abc9a1525234c2ddc5a446dc1189c28c2e7f4eb3 100755
--- a/siena_flow2std
+++ b/siena_flow2std
@@ -12,7 +12,7 @@
 Usage() {
     echo "Usage: siena_flow2std <fileroot2> <fileroot2> [-d]"
     echo "-d : debug (don't delete intermediate files)"
-    exit
+    exit 1
 }
 
 if [ _$FSLDIR = _ ] ; then
diff --git a/sienax b/sienax
index 107ad81f5f4304ba8c016fbb35049897d344c54d..07b91df53b9639652d50e22e4fea9d1654a1556d 100755
--- a/sienax
+++ b/sienax
@@ -22,7 +22,7 @@ Usage() {
     echo "-lm <mask>      : use lesion (or lesion+CSF) mask to remove incorrectly labelled \"grey matter\" voxels"
     echo "-S \"segopts\"    : options to pass to FAST segmentation (inside double-quotes), e.g. -S \"-i 20\""
     echo ""
-    exit
+    exit 1
 }
 
 if [ _$FSLDIR = _ ] ; then