diff --git a/modules/spectrum/init.zsh b/modules/spectrum/init.zsh
index a34f609..3300228 100644
--- a/modules/spectrum/init.zsh
+++ b/modules/spectrum/init.zsh
@@ -5,6 +5,10 @@
 # Return if requirements are not found.
 if [[ ${TERM} == 'dumb' ]]; then
   return 1
+elif
+  [[ -n ${FX} ]]; then
+  # FX is set or sourced by another module
+  return 1
 fi
 
 typeset -gA FX FG BG