diff --git a/zsh/lib/os b/zsh/lib/os
index 87e7147d..301b7b53 100644
--- a/zsh/lib/os
+++ b/zsh/lib/os
@@ -12,17 +12,38 @@ function is_linux {
 
 if is_mac; then
 
-    function pkg_install() {
-        brew install $1
-    }
+    if command_exists brew; then
 
-    function pkg_remove() {
-        brew remove $1
-    }
+        function pkg_install() {
+            brew install $1
+        }
 
-    function pkg_update() {
-        brew update && brew upgrade
-    }
+        function pkg_remove() {
+            brew remove $1
+        }
+
+        function pkg_update() {
+            brew update && brew upgrade
+        }
+
+    else
+    
+        function pkg_install() {
+            echo_r "Homebrew not installed"
+            exit 1
+        }
+
+        function pkg_remove() {
+            echo_r "Homebrew not installed"
+            exit 1
+        }
+
+        function pkg_update() {
+            echo_r "Homebrew not installed"
+            exit 1
+        }
+
+    fi
 
 elif is_deb; then