diff --git a/appveyor.yml b/appveyor.yml
index 26a0d78..8aa199f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -23,7 +23,7 @@ artifacts:
 
 install:
   - set PATH=%MINICONDA%\\Library\\bin;%MINICONDA%\\Scripts;%USERPROFILE%\\.cargo\\bin;%PATH%
-  - set PATH="C:\Program Files (x86)\Inno Setup 5";%PATH%
+  - set PATH="C:\\Program Files (x86)\\Inno Setup 5";%PATH%
   - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
   - rustup-init -yv --default-toolchain nightly --default-host x86_64-pc-windows-msvc
   - if defined VCVARS call "%VCVARS%" %VCVARSARG%