diff --git a/zsh/theme.zsh b/zsh/theme.zsh
index 50e7eee4..b55d4a54 100644
--- a/zsh/theme.zsh
+++ b/zsh/theme.zsh
@@ -1 +1,15 @@
+# Re-add prezto module function paths to $fpath. Some flows (compinit's
+# insecure-directory check, group-writable home dirs) can strip these,
+# which leaves skwp's precmd calling autoload-declared-but-unfindable
+# functions like git-info/ruby-info, producing
+#   "zsh: bad math expression: operand expected at '%F{135}%n%...'"
+# and cascading errors in zsh-syntax-highlighting.
+() {
+  local module dir
+  for module in helper git ruby; do
+    dir="${ZDOTDIR:-$HOME}/.zprezto/modules/$module/functions"
+    [[ -d $dir && ${fpath[(I)$dir]} -eq 0 ]] && fpath=($dir $fpath)
+  done
+}
+
 prompt skwp