2 files changed, 4 insertions, 3 deletions

diff --git a/src/WixToolset.Mba.Core/Engine.cs b/src/WixToolset.Mba.Core/Engine.cs
index 408278ed..2c544f29 100644
--- a/src/WixToolset.Mba.Core/Engine.cs
+++ b/src/WixToolset.Mba.Core/Engine.cs
@@ -79,7 +79,7 @@ namespace WixToolset.Mba.Core
                     IntPtr pValue = Marshal.SecureStringToCoTaskMemUnicode(value);
                     try
                     {
-                        this.engine.SetVariableString(name, pValue);
+                        this.engine.SetVariableString(name, pValue, true);
                     }
                     finally
                     {
@@ -115,7 +115,7 @@ namespace WixToolset.Mba.Core
                     IntPtr pValue = Marshal.StringToCoTaskMemUni(value);
                     try
                     {
-                        this.engine.SetVariableString(name, pValue);
+                        this.engine.SetVariableString(name, pValue, true);
                     }
                     finally
                     {
diff --git a/src/WixToolset.Mba.Core/IBootstrapperEngine.cs b/src/WixToolset.Mba.Core/IBootstrapperEngine.cs
index d070998e..85ca8693 100644
--- a/src/WixToolset.Mba.Core/IBootstrapperEngine.cs
+++ b/src/WixToolset.Mba.Core/IBootstrapperEngine.cs
@@ -106,7 +106,8 @@ namespace WixToolset.Mba.Core
 
         void SetVariableString(
             [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
-                                              IntPtr wzValue
+                                              IntPtr wzValue,
+            [MarshalAs(UnmanagedType.Bool)]   bool fFormatted
             );
 
         void SetVariableVersion(