diff --git a/extdep/getstuff.bat b/extdep/getstuff.bat
index 8fe3ba944..531be8fde 100644
--- a/extdep/getstuff.bat
+++ b/extdep/getstuff.bat
@@ -29,7 +29,7 @@ if not exist %eth_name%-%eth_version%.tar.gz (
 	bitsadmin /transfer %eth_name%-%eth_version%.tar.gz /download /priority normal %eth_server%/%eth_name%-%eth_version%.tar.gz %cd%\%eth_name%-%eth_version%.tar.gz
 	bitsadmin /cancel %eth_name%-%eth_version%.tar.gz
 )
-if not exist %eth_name%-%eth_version% tar -zxvf %eth_name%-%eth_version%.tar.gz
+if not exist %eth_name%-%eth_version% cmake -E tar -zxvf %eth_name%-%eth_version%.tar.gz
 cmake -E copy_directory %eth_name%-%eth_version% ..\install\windows
 
 cd ..