diff --git a/Modules/UseSWIG.cmake b/Modules/UseSWIG.cmake
index 5b653add14..fd6596b854 100644
--- a/Modules/UseSWIG.cmake
+++ b/Modules/UseSWIG.cmake
@@ -990,6 +990,9 @@ function(SWIG_ADD_LIBRARY name)
       endif()
       set_target_properties (${target_name} PROPERTIES PREFIX "")
     endif()
+    if (APPLE)
+      set_target_properties (${target_name} PROPERTIES SUFFIX ".dylib")
+    endif ()
   else()
     # assume empty prefix because we expect the module to be dynamically loaded
     set_target_properties (${target_name} PROPERTIES PREFIX "")