diff --git a/Modules/UseSWIG.cmake b/Modules/UseSWIG.cmake
index 7423418..1862876 100644
--- a/Modules/UseSWIG.cmake
+++ b/Modules/UseSWIG.cmake
@@ -156,7 +156,7 @@ macro(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   SWIG_GET_EXTRA_OUTPUT_FILES(${SWIG_MODULE_${name}_LANGUAGE}
     swig_extra_generated_files
     "${swig_outdir}"
-    "${infile}")
+    "${swig_source_file_fullname}")
   set(swig_generated_file_fullname
     "${swig_outdir}/${swig_source_file_name_we}")
   # add the language into the name of the file (i.e. TCL_wrap)