diff --git a/modules/TDEMacros.cmake b/modules/TDEMacros.cmake
index cd0f35e..59318be 100644
--- a/modules/TDEMacros.cmake
+++ b/modules/TDEMacros.cmake
@@ -831,7 +831,7 @@ macro( tde_add_library _arg_target )
 
     # install base soname
     if( _release AND NOT "STATIC" STREQUAL ${_type} )
-      tde_get_library_filename( _output ${_target} )
+      tde_get_library_filename( _soname ${_target} )
       string( REPLACE "-${_release}" "" _soname_base "${_soname}" )
       if( _version )
         get_target_property( _soversion ${_target} SOVERSION )