diff --git a/scripts/env.sh b/scripts/env.sh
index 9e9b2d1..d2298ff 100755
--- a/scripts/env.sh
+++ b/scripts/env.sh
@@ -68,12 +68,14 @@ $EXPORT_FUNC add_submodule
 
 export NIMBUS_BUILD_SYSTEM=yes
 
-if [[ $# == 1 && $1 == "bash" ]]; then
-	# the only way to change PS1 in a child shell, apparently
-	# (we're not getting the original PS1 value in here, so set a complete and nice prompt)
-	export PS1="[Nimbus env] \[\033[0;31m\]\l \[\033[1;33m\]\d \[\033[1;36m\]\t \[\033[0;32m\]|\w|\[\033[0m\]\n\u\$ "
-	exec "$1" --login --noprofile
-else
-	# can't use "exec" here if we're getting function names as params
-	"$@"
+if [[ ! -n "$NBS_ONLY_LOAD_ENV_VARS" ]]; then
+  if [[ $# == 1 && $1 == "bash" ]]; then
+    # the only way to change PS1 in a child shell, apparently
+    # (we're not getting the original PS1 value in here, so set a complete and nice prompt)
+    export PS1="[Nimbus env] \[\033[0;31m\]\l \[\033[1;33m\]\d \[\033[1;36m\]\t \[\033[0;32m\]|\w|\[\033[0m\]\n\u\$ "
+    exec "$1" --login --noprofile
+  else
+    # can't use "exec" here if we're getting function names as params
+   "$@"
+  fi
 fi