diff --git a/src/Main/Forms/WaitDialog.cpp b/src/Main/Forms/WaitDialog.cpp
index 9d233e1f..579df614 100644
--- a/src/Main/Forms/WaitDialog.cpp
+++ b/src/Main/Forms/WaitDialog.cpp
@@ -64,10 +64,11 @@ namespace VeraCrypt
 		VC_CONVERT_EXCEPTION (UnsupportedSectorSizeNoKernelCrypto);
 		VC_CONVERT_EXCEPTION (VolumeAlreadyMounted);
 		VC_CONVERT_EXCEPTION (VolumeSlotUnavailable);
-		VC_CONVERT_EXCEPTION (UserInterfaceException);
+		// Handle UserInterfaceException subclasses before the base class to avoid slicing.
 		VC_CONVERT_EXCEPTION (MissingArgument);
 		VC_CONVERT_EXCEPTION (NoItemSelected);
 		VC_CONVERT_EXCEPTION (StringFormatterException);
+		VC_CONVERT_EXCEPTION (UserInterfaceException);
 		VC_CONVERT_EXCEPTION (FilesystemDismountFailed);
 		VC_CONVERT_EXCEPTION (ExecutedProcessFailed);
 		VC_CONVERT_EXCEPTION (AlreadyInitialized);
diff --git a/src/Main/UserInterface.cpp b/src/Main/UserInterface.cpp
index 2a5fd71a..feb40978 100644
--- a/src/Main/UserInterface.cpp
+++ b/src/Main/UserInterface.cpp
@@ -1903,10 +1903,11 @@ const FileManager fileManagers[] = {
 		VC_CONVERT_EXCEPTION (UnsupportedSectorSizeNoKernelCrypto);
 		VC_CONVERT_EXCEPTION (VolumeAlreadyMounted);
 		VC_CONVERT_EXCEPTION (VolumeSlotUnavailable);
-		VC_CONVERT_EXCEPTION (UserInterfaceException);
+		// Handle UserInterfaceException subclasses before the base class to avoid slicing.
 		VC_CONVERT_EXCEPTION (MissingArgument);
 		VC_CONVERT_EXCEPTION (NoItemSelected);
 		VC_CONVERT_EXCEPTION (StringFormatterException);
+		VC_CONVERT_EXCEPTION (UserInterfaceException);
 		VC_CONVERT_EXCEPTION (FilesystemDismountFailed);
 		VC_CONVERT_EXCEPTION (ExecutedProcessFailed);
 		VC_CONVERT_EXCEPTION (AlreadyInitialized);