diff --git a/Tests/Wrapping/CMakeLists.txt b/Tests/Wrapping/CMakeLists.txt
index aca36bc31..7d9a4c67f 100644
--- a/Tests/Wrapping/CMakeLists.txt
+++ b/Tests/Wrapping/CMakeLists.txt
@@ -93,7 +93,7 @@ add_library(wraplibFLTK ${wraplibFLTK_FLTK_UI_SRCS})
 add_dependencies(wraplibFLTK fakefluid)
 add_dependencies(fakefluid Wrap)
 fltk_wrap_ui (wrapFLTK fltk2.fl)
-add_executable(wrapFLTK wrapFLTK.c ${wrapFLTK_FLTK_UI_SRCS})
+add_executable(wrapFLTK wrapFLTK.cxx ${wrapFLTK_FLTK_UI_SRCS})
 target_link_libraries(wrapFLTK wraplibFLTK)
 add_dependencies(wrapFLTK fakefluid)
 
diff --git a/Tests/Wrapping/wrapFLTK.c b/Tests/Wrapping/wrapFLTK.cxx
similarity index 100%
rename from Tests/Wrapping/wrapFLTK.c
rename to Tests/Wrapping/wrapFLTK.cxx