diff --git a/modules/TDEMacros.cmake b/modules/TDEMacros.cmake
index 6156b79..8bb1d2b 100644
--- a/modules/TDEMacros.cmake
+++ b/modules/TDEMacros.cmake
@@ -922,6 +922,7 @@ macro( tde_add_library _arg_target )
       else( )
         set( _location "${_destination}/${_output}" )
         set( _soname "${_output}" )
+        unset( _version )
       endif( )
 
       configure_file( ${CMAKE_SOURCE_DIR}/cmake/modules/template_export_library.cmake "${PROJECT_BINARY_DIR}/export-${_target}.cmake" @ONLY )