diff --git a/appveyor.yml b/appveyor.yml
index 4ad421c0..15356776 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -6,7 +6,7 @@ install:
   - Win32OpenSSL-1_0_2.exe /silent /verysilent /sp- /suppressmsgboxes
   - appveyor DownloadFile ftp://sourceware.org/pub/pthreads-win32/pthreads-w32-2-9-1-release.zip
   - md C:\pthreads
-  - 7za -y x pthreads-w32-2-9-1-release.zip -o C:\pthreads
+  - 7z -y x pthreads-w32-2-9-1-release.zip -o C:\pthreads
 
 build: