diff --git a/.appveyor.yml b/.appveyor.yml
index 795173ae..587c69bd 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -35,7 +35,7 @@ build_script:
     xcopy lang\*.qm installer\translations\ /sy
     xcopy icons\symbols installer\symbols /i
     copy licence.txt installer
-    IF EXISTS OPENSSLDIR (
+    IF DEFINED OPENSSLDIR (
       copy %OPENSSLDIR%\libcrypto-*-x64.dll installer
       copy %OPENSSLDIR%\libssl-*-x64.dll installer
     )