diff --git a/appveyor.yml b/appveyor.yml
index 019aa5c73e2828eb363d5c4a308b9b074aab84e4..b3e62b24b7fb96cbdc87687b88d2ef0ed7253402 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -30,7 +30,7 @@ services:
 
 build_script:
       - python setupLibs.py
-      - python %TSK_HOME%\win32\updateBuildLibs.py -m
+      - python win32\updateBuildLibs.py -m
       - ps: ant -version
       - ps: pushd bindings/java
       - cmd: ant dist-PostgreSQL
diff --git a/win32/updateBuildLibs.py b/win32/updateBuildLibs.py
index 442d7163dd206c3082c47a77155ed1d990b42cfd..96922280662ad28b4ef6c3706a19efc2bfa7763c 100644
--- a/win32/updateBuildLibs.py
+++ b/win32/updateBuildLibs.py
@@ -20,7 +20,6 @@
 CURRENT_PATH = os.getcwd()
 # save the build log in the output directory
 LOG_PATH = os.path.join(CURRENT_PATH, 'output', time.strftime("%Y.%m.%d-%H.%M.%S"))
-APPVEYOR = os.getenv("APPVEYOR",False)
 MINIMAL = False
 def pullAndBuildAllDependencies(branch):
     '''
@@ -210,7 +209,11 @@ def buildTSK(wPlatform, target):
 
     print ("Building TSK " + str(wPlatform) + "-bit " + target + " build.")
     sys.stdout.flush()
-    if(APPVEYOR):
+    TSK_HOME = os.getenv("TSK_HOME",False)
+
+    if not TSK_HOME:
+        print("Please set the TSK_HOME env variable")
+    else:
         os.chdir(os.path.join(os.getenv("TSK_HOME"),"win32"))
 
     vs = []