diff --git a/toolflow/src/main/scala/com/minres/tgc/hammer/Global.scala b/toolflow/src/main/scala/com/minres/tgc/hammer/Global.scala
index 04d0854..1c9dd01 100644
--- a/toolflow/src/main/scala/com/minres/tgc/hammer/Global.scala
+++ b/toolflow/src/main/scala/com/minres/tgc/hammer/Global.scala
@@ -3,7 +3,7 @@ package com.minres.tgc.hammer
 import os.Path
 
 object Global {
-  def pathFromEnv(env: String): Option[Path] = sys.env.get("string").map { rawPath => Path(rawPath, os.pwd) }
+  def pathFromEnv(env: String): Option[Path] = sys.env.get(env).map { rawPath => Path(rawPath, os.pwd) }
   lazy val HAMMER: Path = pathFromEnv("TGC_HAMMER_HOME").get
   lazy val WORKDIR: Path = pathFromEnv("TGC_HAMMER_WORKDIR").get
   lazy val TREENAIL: Path = HAMMER / "deps" / "treenail"