diff --git a/forgit.plugin.zsh b/forgit.plugin.zsh
index 21bf56c..84696ee 100755
--- a/forgit.plugin.zsh
+++ b/forgit.plugin.zsh
@@ -21,8 +21,10 @@ FORGIT="$INSTALL_DIR/bin/git-forgit"
 # backwards compatibility:
 # export all user-defined FORGIT variables to make them available in git-forgit
 unexported_vars=0
+# Set posix mode in bash to only get variables, see #256.
+[[ -n "$BASH_VERSION" ]] && set -o posix
 set | awk -F '=' '{ print $1 }' | grep FORGIT_ | while read -r var; do
-    if ! export | grep -q "^$var="; then
+    if ! export | grep -q "\(^$var=\|^export $var=\)"; then
         if [[ $unexported_vars == 0 ]]; then
             forgit::warn "Config options have to be exported in future versions of forgit."
             forgit::warn "Please update your config accordingly:"
@@ -33,6 +35,7 @@ set | awk -F '=' '{ print $1 }' | grep FORGIT_ | while read -r var; do
         export "$var"
     fi
 done
+[[ -n "$BASH_VERSION" ]] && set +o posix
 
 # register shell functions
 forgit::log() {