diff --git a/autoenv.zsh b/autoenv.zsh
index 14e8159..0cc0566 100644
--- a/autoenv.zsh
+++ b/autoenv.zsh
@@ -136,7 +136,7 @@ _autoenv_hash_pair() {
     fi
     env_shasum=$(shasum $env_file | cut -d' ' -f1)
   fi
-  echo "$env_file:$env_shasum:1"
+  echo ":${env_file}:${env_shasum}:1"
 }
 
 _autoenv_authorized_env_file() {
@@ -147,15 +147,15 @@ _autoenv_authorized_env_file() {
 }
 
 _autoenv_authorize() {
-  local env_file=$1
+  local env_file=${1:A}
   _autoenv_deauthorize $env_file
   _autoenv_hash_pair $env_file >> $AUTOENV_ENV_FILENAME
 }
 
 _autoenv_deauthorize() {
-  local env_file=$1
+  local env_file=${1:A}
   if [[ -s $AUTOENV_ENV_FILENAME ]]; then
-    echo "$(\grep -vF $env_file $AUTOENV_ENV_FILENAME)" > $AUTOENV_ENV_FILENAME
+    echo "$(\grep -vF :${env_file}: $AUTOENV_ENV_FILENAME)" > $AUTOENV_ENV_FILENAME
   fi
 }
 
diff --git a/tests/_autoenv_utils.t b/tests/_autoenv_utils.t
index c8c4a8c..3da1fde 100644
--- a/tests/_autoenv_utils.t
+++ b/tests/_autoenv_utils.t
@@ -35,39 +35,39 @@ Now adding some auth pair.
   $ echo first > first
   $ _autoenv_authorize first
   $ cat $AUTOENV_ENV_FILENAME
-  /tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
 
 And a second one.
 
   $ echo second > second
   $ _autoenv_authorize second
   $ cat $AUTOENV_ENV_FILENAME
-  /tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
 
 And a third.
 
   $ echo third > third
   $ _autoenv_authorize third
   $ cat $AUTOENV_ENV_FILENAME
-  /tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/third:ad180453bf8a374a15df3e90a78c180230146a7c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/third:ad180453bf8a374a15df3e90a78c180230146a7c:1 (glob)
 
 Re-add the second one, with the same hash.
 
   $ _autoenv_authorize second
   $ cat $AUTOENV_ENV_FILENAME
-  /tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/third:ad180453bf8a374a15df3e90a78c180230146a7c:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/first:271ac93c44ac198d92e706c6d6f1d84aefcfa337:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/third:ad180453bf8a374a15df3e90a78c180230146a7c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
 
 Re-add the first one, with a new hash.
 
   $ echo one more line >> first
   $ _autoenv_authorize first
   $ cat $AUTOENV_ENV_FILENAME
-  /tmp/cramtests-*/_autoenv_utils.t/third:ad180453bf8a374a15df3e90a78c180230146a7c:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
-  /tmp/cramtests-*/_autoenv_utils.t/first:65eb010197b73ddc109b7210080f97a87f53451e:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/third:ad180453bf8a374a15df3e90a78c180230146a7c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/second:7bee8f3b184e1e141ff76efe369c3b8bfc50e64c:1 (glob)
+  :/tmp/cramtests-*/_autoenv_utils.t/first:65eb010197b73ddc109b7210080f97a87f53451e:1 (glob)
 }}}