diff --git a/build.psm1 b/build.psm1
index 5e3df68bd..2d51923a9 100644
--- a/build.psm1
+++ b/build.psm1
@@ -688,7 +688,7 @@ function Start-PSBootstrap {
             sudo apt-get install -y -qq $Deps
         } elseif ($IsCentOS) {
             # Build tools
-            $Deps += "curl", "gcc-c++", "cmake", "make"
+            $Deps += "which", "curl", "gcc-c++", "cmake", "make"
 
             # .NET Core required runtime libraries
             $Deps += "libicu", "libunwind"