diff --git a/appveyor.yml b/appveyor.yml
index b3797754f..eac72ffee 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -33,6 +33,9 @@ install:
 
   - rustc -V
   - cargo -V
+  - if "%TOOLCHAIN%" == "msvc" if "%PLATFORM%" == "i686" call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat"
+  - if "%TOOLCHAIN%" == "msvc" if "%PLATFORM%" == "x86_64" "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64
+  - if "%TOOLCHAIN%" == "msvc" if "%PLATFORM%" == "x86_64" call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" x86_amd64
 
 artifacts:
   - path: target\debug\uutils.exe
diff --git a/src/expr/Cargo.toml b/src/expr/Cargo.toml
index 8355b4e2d..6e8176b3e 100644
--- a/src/expr/Cargo.toml
+++ b/src/expr/Cargo.toml
@@ -9,7 +9,7 @@ path = "expr.rs"
 
 [dependencies]
 libc = "*"
-onig = "1.1"
+onig = "1.3"
 uucore = { path="../uucore" }
 
 [[bin]]