diff --git a/bash/environment b/bash/environment
index b6d6b2b..034d29e 100644
--- a/bash/environment
+++ b/bash/environment
@@ -36,6 +36,9 @@ fi
 
 function _add-path {
     dir="$1"
+    if [[ $PATH =~ .*$dir.* ]]; then
+        return
+    fi
     if [[ -d $dir ]]; then
         PATH=$dir:$PATH
     fi