diff --git a/hooks/centos-4/90-make-fstab b/hooks/centos-4/90-make-fstab
index 841fd33..81201c7 100755
--- a/hooks/centos-4/90-make-fstab
+++ b/hooks/centos-4/90-make-fstab
@@ -59,7 +59,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"
     
diff --git a/hooks/centos-5/90-make-fstab b/hooks/centos-5/90-make-fstab
index 841fd33..81201c7 100755
--- a/hooks/centos-5/90-make-fstab
+++ b/hooks/centos-5/90-make-fstab
@@ -59,7 +59,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"
     
diff --git a/hooks/dapper/90-make-fstab b/hooks/dapper/90-make-fstab
index 9efa5fd..6131a52 100755
--- a/hooks/dapper/90-make-fstab
+++ b/hooks/dapper/90-make-fstab
@@ -56,7 +56,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"
     
diff --git a/hooks/debian/90-make-fstab b/hooks/debian/90-make-fstab
index c8c71b6..a3c9fff 100755
--- a/hooks/debian/90-make-fstab
+++ b/hooks/debian/90-make-fstab
@@ -55,7 +55,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"
     
diff --git a/hooks/edgy/90-make-fstab b/hooks/edgy/90-make-fstab
index 9efa5fd..6131a52 100755
--- a/hooks/edgy/90-make-fstab
+++ b/hooks/edgy/90-make-fstab
@@ -56,7 +56,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"
     
diff --git a/hooks/fedora-core-6/90-make-fstab b/hooks/fedora-core-6/90-make-fstab
index 841fd33..81201c7 100755
--- a/hooks/fedora-core-6/90-make-fstab
+++ b/hooks/fedora-core-6/90-make-fstab
@@ -59,7 +59,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"
     
diff --git a/hooks/gentoo/90-make-fstab b/hooks/gentoo/90-make-fstab
index 77bbe47..1c5d5f7 100755
--- a/hooks/gentoo/90-make-fstab
+++ b/hooks/gentoo/90-make-fstab
@@ -56,7 +56,7 @@ for part in `seq 1 ${NUMPARTITIONS}`; do
     x=0
     for partdata in ${PARTITION}; do
         eval "partdata${x}=\"${partdata}\""
-        x=$(( x+1 ))
+        x=$(( $x+1 ))
     done
     IFS="${OLDIFS}"