diff --git a/CMake/CTestCustom.cmake.in b/CMake/CTestCustom.cmake.in
index 10e97eab590421d2c4d813d3cf91aadabf045caf..b63e3684a91a2fcfeda20a8e0bb4a78fd86bf185 100644
--- a/CMake/CTestCustom.cmake.in
+++ b/CMake/CTestCustom.cmake.in
@@ -53,7 +53,6 @@ set(CTEST_CUSTOM_WARNING_EXCEPTION
   "ranlib: file: .+ has no symbols"
   "ranlib:.*warning for library:.*the table of contents is empty.*no object file members in the library define global symbols.*"
   "libtool:.*file:.*has no symbols"
-  "Fl_Image.H:.*warning:.*dereferencing type-punned pointer will break strict-aliasing rules.*"
   "warning -.: directory name .* does not exist"
   "ld.*warning.*duplicate dylib.*"
   "WARNING non-zero return value in ctest"