diff --git a/completion/brew.completion.bash b/completion/brew.completion.bash
index 89c4646..a0d9819 100644
--- a/completion/brew.completion.bash
+++ b/completion/brew.completion.bash
@@ -1,3 +1,5 @@
-if [ -f `brew --prefix`/Library/Contributions/brew_bash_completion.sh ]; then
-  . `brew --prefix`/Library/Contributions/brew_bash_completion.sh
-fi
+if [ `which brew` ]; then
+  if [ -f `brew --prefix`/Library/Contributions/brew_bash_completion.sh ]; then
+    . `brew --prefix`/Library/Contributions/brew_bash_completion.sh
+  fi
+fi
\ No newline at end of file