diff --git a/init.zsh b/init.zsh
index 84402a0..e45db72 100644
--- a/init.zsh
+++ b/init.zsh
@@ -142,7 +142,13 @@ fi
 export VISUAL="${EDITOR}"
 
 # Make SBCL *slightly* less frustrating to use on the command line
-alias sbcl='rlwrap -pblue -q "\"" sbcl'
+if cmd_exists sbcl; then
+    alias sbcl='rlwrap -pblue -q "\"" sbcl'
+fi
+# Maxima too
+if cmd_exists maxima; then
+    alias maxima='rlwrap -pblue -q "\"" maxima'
+fi
 
 # Safer file functions
 alias cp="cp -i"