diff --git a/R/versions.R b/R/versions.R
index 29ab99f..4790535 100644
--- a/R/versions.R
+++ b/R/versions.R
@@ -79,7 +79,7 @@ atime_versions_install <- function(Package, pkg.path, new.Package.vec, sha.vec,
           new.Package=new.Package,
           sha=sha, 
           new.pkg.path=sha.path)
-        INSTALL.cmd <- paste("R CMD INSTALL", sha.path)
+        INSTALL.cmd <- paste('"$R_HOME/bin/R" CMD INSTALL', sha.path)
         status.int <- system(INSTALL.cmd)
         if(status.int != 0){
           stop(INSTALL.cmd, " returned error status code ", status.int)