diff --git a/cmake/CTestCustom.cmake.in b/cmake/CTestCustom.cmake.in
index d92f5ec5..39c2c4d7 100644
--- a/cmake/CTestCustom.cmake.in
+++ b/cmake/CTestCustom.cmake.in
@@ -20,6 +20,7 @@ set(CTEST_CUSTOM_COVERAGE_EXCLUDE
 
   # Exclude files from the ThirdParty Utilities directories
   ".*/thirdparty/.*"
+  ".*libtiff.*"
   )
 
 set(CTEST_CUSTOM_WARNING_EXCEPTION