diff --git a/CTestCustom.cmake.in b/CTestCustom.cmake.in
index fd5d7441d..f499be1d9 100644
--- a/CTestCustom.cmake.in
+++ b/CTestCustom.cmake.in
@@ -56,6 +56,8 @@ set(CTEST_CUSTOM_WARNING_EXCEPTION
   "warning.*This version of Mac OS X is unsupported"
   "clang.*: warning: argument unused during compilation: .-g"
   "note: in expansion of macro" # diagnostic context note
+  "cm(StringCommand|CTestTestHandler)\\.cxx.*warning.*rand.*isn.*t random" # we do not do crypto
+  "cm(StringCommand|CTestTestHandler)\\.cxx.*warning.*srand.*seed choices are.*poor" # we do not do crypto
 
   # Ignore clang's summary warning, assuming prior text has matched some
   # other warning expression: