diff --git a/bin/autojump.sh b/bin/autojump.sh
index 3a25edf..0742040 100644
--- a/bin/autojump.sh
+++ b/bin/autojump.sh
@@ -21,7 +21,10 @@ elif [ -s ~/.autojump/share/autojump/autojump.${shell} ]; then
 	source ~/.autojump/share/autojump/autojump.${shell}
 
 # check global install
-elif [ -s /usr/local/share/autojump/autojump.${shell} ]; then
-	source /usr/local/share/autojump/autojump.${shell}
+elif [ -s ${share_dir}/autojump.${shell} ]; then
+	source ${share_dir}/autojump.${shell}
 
+# check custom install
+elif [ -s ${etc_dir}/autojump.${shell} ]; then
+	source ${etc_dir}/autojump.${shell}
 fi
diff --git a/install.py b/install.py
index 09fd557..ed3b80a 100755
--- a/install.py
+++ b/install.py
@@ -9,6 +9,7 @@ import sys
 
 sys.path.append('bin')
 from autojump_argparse import ArgumentParser
+from string import Template
 
 SUPPORTED_SHELLS = ('bash', 'zsh', 'fish', 'tcsh')
 
@@ -29,16 +30,16 @@ def mkdir(path, dryrun=False):
         os.makedirs(path)
 
 
-def modify_autojump_sh(etc_dir, dryrun=False):
+def modify_autojump_sh(etc_dir, share_dir, dryrun=False):
     """Append custom installation path to autojump.sh"""
-    custom_install = "\
-        \n# check custom install \
-        \nif [ -s %s/autojump.${shell} ]; then \
-            \n\tsource %s/autojump.${shell} \
-        \nfi\n" % (etc_dir, etc_dir)
 
-    with open(os.path.join(etc_dir, 'autojump.sh'), 'a') as f:
-        f.write(custom_install)
+    autojumpsh = os.path.join(etc_dir, 'autojump.sh')
+    with open(autojumpsh, 'r') as f:
+        content = f.read()
+    tmpl = Template(content)
+    new_content = tmpl.safe_substitute(etc_dir=etc_dir, share_dir=share_dir)
+    with open(autojumpsh, 'w') as f:
+        f.write(new_content)
 
 
 def modify_autojump_lua(clink_dir, bin_dir, dryrun=False):
@@ -207,7 +208,7 @@ def main(args):
         cp('./bin/_j', zshshare_dir, args.dryrun)
 
         if args.custom_install:
-            modify_autojump_sh(etc_dir, args.dryrun)
+            modify_autojump_sh(etc_dir, share_dir, args.dryrun)
 
     show_post_installation_message(etc_dir, share_dir, bin_dir)