diff --git a/CMake/CTestCustom.cmake.in b/CMake/CTestCustom.cmake.in
index b3c4931e..487f8b99 100644
--- a/CMake/CTestCustom.cmake.in
+++ b/CMake/CTestCustom.cmake.in
@@ -29,4 +29,6 @@ SET(CTEST_CUSTOM_WARNING_EXCEPTION
   ".*warning,.* is deprecated"
   # supress warnings caused by 3rd party libs:
   ".*/thirdparty/.*"
+  "libtiff.*has no symbols"
+  "libpng.*has no symbols"
   )