diff --git a/eternalize_bash.sh b/eternalize_bash.sh
index 77295ee..8a414cc 100755
--- a/eternalize_bash.sh
+++ b/eternalize_bash.sh
@@ -64,7 +64,7 @@ if [ -f ${OLD_HISTORY} ]; then
 fi
 
 # OS X does not automatically run .bashrc, add it as source to .bash_profile.
-if [ "${TERM_PROGRAM}" == "Apple_Terminal" ]; then
+if which -s uname && [ $(uname) = "Darwin" ]; then
   echo "OS X detected, adding source to ${BASH_RC} in .bash_profile"
   echo source ~/${BASH_RC} >> .bash_profile
 fi