diff --git a/.bashrc b/.bashrc
index 522a590..e8891b4 100644
--- a/.bashrc
+++ b/.bashrc
@@ -195,7 +195,8 @@ __read_ssh_agents() {
     # Do locking the sucky way on macOS.
     for ((I = 0; I <= 5; I++)); do
       if shlock -p "$$" -f "$HOME/.ssh/agents.lock"; then
-        exec {FD}<"$HOME/.ssh/agents"
+        exec 9<"$HOME/.ssh/agents"
+        FD="9"
         # Make note of the mtime for use in write_ssh_agents.
         SSH_AGENTS_MTIME="$(stat -f %Fm "$HOME/.ssh/agents")"
         ERR=0
@@ -221,7 +222,7 @@ __read_ssh_agents() {
   ERR=$?
 
   # Close the file descriptor (which on Linux releases the flock too).
-  exec {FD}<&-
+  : "$FD"<&-
 
   # On Darwin, release the lock on the file.
   rm -f  "$HOME/.ssh/agents.lock"
@@ -266,7 +267,7 @@ __write_ssh_agents() {
     (( ${MTIME/\.} > SSH_AGENTS_MTIME )) && return 2
 
     # Lock the agents file.
-    exec {FD}<"$HOME/.ssh/agents" && flock -E 10 -e -w 0.5 "$FD"
+    exec {FD}>"$HOME/.ssh/agents" && flock -E 10 -e -w 0.5 "$FD"
     ERR=$?
     if (( ERR == 10 )); then
       printf "\\033[1;31m%s\\033[39m\\n" "Failed to obtain lock on ~/.ssh/agents." >&2
@@ -277,13 +278,14 @@ __write_ssh_agents() {
     fi
   elif [[ "$(uname -s)" == "Darwin" ]]; then
     # Make sure SSH_AUTH_SOCKS has the most up to date data.
-    MTIME="$(stat --format=%.9Y "$HOME/.ssh/agents")"
+    MTIME="$(stat -f %Fm "$HOME/.ssh/agents")"
     (( ${MTIME/\.} > SSH_AGENTS_MTIME )) && return 2
 
     # Do locking the sucky way on OSX.
     for ((I = 0; I <= 5; I++)); do
       if shlock -p "$$" -f "$HOME/.ssh/agents.lock"; then
-        exec {FD}<"$HOME/.ssh/agents"
+        exec 9>"$HOME/.ssh/agents"
+        FD="9"
         ERR=0
         break
       else
@@ -305,7 +307,7 @@ __write_ssh_agents() {
   [[ -n "${SOCKS[*]}" ]] && { printf "%s\\n" "${SOCKS[@]}" >"$HOME/.ssh/agents" 2>/dev/null; ERR=$?; }
 
   # Release locks.
-  exec {FD}>&-
+  : "$FD"<&-
   rm -f  "$HOME/.ssh/agents.lock"
 
   # Error out if the data couldn't be written.