diff --git a/dnvm.ps1 b/dnvm.ps1
index 33a2075826..85d242e866 100644
--- a/dnvm.ps1
+++ b/dnvm.ps1
@@ -67,7 +67,7 @@ function _WriteOut {
 
 ### Constants
 $ProductVersion="1.0.0"
-$BuildVersion="beta8-15510"
+$BuildVersion="beta8-15511"
 $Authors="Microsoft Open Technologies, Inc."
 
 # If the Version hasn't been replaced...
@@ -400,8 +400,12 @@ function Get-RuntimeAliasOrRuntimeInfo(
     if(Test-Path $aliasPath) {
         $BaseName = Get-Content $aliasPath
 
-        $Architecture = Get-PackageArch $BaseName
-        $Runtime = Get-PackageRuntime $BaseName
+        if(!$Architecture) {
+            $Architecture = Get-PackageArch $BaseName
+        }
+        if(!$Runtime) {
+            $Runtime = Get-PackageRuntime $BaseName
+        }
         $Version = Get-PackageVersion $BaseName
         $OS = Get-PackageOS $BaseName
     }
@@ -1550,7 +1554,7 @@ function dnvm-use {
         return;
     }
     
-    $runtimeInfo = Get-RuntimeAliasOrRuntimeInfo -Version:$VersionOrAlias -Architecture:$Architecture -Runtime:$Runtime -OS:$OS 
+    $runtimeInfo = Get-RuntimeAliasOrRuntimeInfo -Version:$VersionOrAlias -Architecture:$Architecture -Runtime:$Runtime -OS:$OS
     $runtimeFullName = $runtimeInfo.RuntimeName
     $runtimeBin = Get-RuntimePath $runtimeFullName
     if ($runtimeBin -eq $null) {
diff --git a/dnvm.sh b/dnvm.sh
index f4f22348ed..648c39909e 100644
--- a/dnvm.sh
+++ b/dnvm.sh
@@ -2,7 +2,7 @@
 # Source this file from your .bash-profile or script to use
 
 # "Constants"
-_DNVM_BUILDNUMBER="beta8-15510"
+_DNVM_BUILDNUMBER="beta8-15511"
 _DNVM_AUTHORS="Microsoft Open Technologies, Inc."
 _DNVM_RUNTIME_PACKAGE_NAME="dnx"
 _DNVM_RUNTIME_FRIENDLY_NAME=".NET Execution Environment"
@@ -333,24 +333,30 @@ __dnvm_requested_version_or_alias() {
     else
         if [ -e "$_DNVM_ALIAS_DIR/$versionOrAlias.alias" ]; then
             local runtimeFullName=$(cat "$_DNVM_ALIAS_DIR/$versionOrAlias.alias")
-            echo "$runtimeFullName"
-        else
-            local pkgVersion=$versionOrAlias
-            local pkgArchitecture="x64"
-            local pkgSystem=$os
-
-            if [[ -z $runtime || "$runtime" == "mono" ]]; then
-                echo "$_DNVM_RUNTIME_PACKAGE_NAME-mono.$pkgVersion"
-            else
-                if [ "$arch" != "" ]; then
-                    local pkgArchitecture="$arch"
-                fi
-                if [ "$os" == "" ]; then
-                    local pkgSystem=$(__dnvm_current_os)
-                fi
-
-                echo "$_DNVM_RUNTIME_PACKAGE_NAME-$runtime-$pkgSystem-$pkgArchitecture.$pkgVersion"
+            if [[ ! -n "$runtime" && ! -n "$arch" ]]; then
+                echo "$runtimeFullName"
+                return
             fi
+            local pkgVersion=$(__dnvm_package_version "$runtimeFullName")
+        fi
+
+        if [[ ! -n "$pkgVersion" ]]; then
+            local pkgVersion=$versionOrAlias
+        fi
+        local pkgArchitecture="x64"
+        local pkgSystem=$os
+
+        if [[ -z $runtime || "$runtime" == "mono" ]]; then
+            echo "$_DNVM_RUNTIME_PACKAGE_NAME-mono.$pkgVersion"
+        else
+            if [ "$arch" != "" ]; then
+                local pkgArchitecture="$arch"
+            fi
+            if [ "$os" == "" ]; then
+                local pkgSystem=$(__dnvm_current_os)
+            fi
+
+            echo "$_DNVM_RUNTIME_PACKAGE_NAME-$runtime-$pkgSystem-$pkgArchitecture.$pkgVersion"
         fi
     fi
 }