diff --git a/CTestCustom.cmake.in b/CTestCustom.cmake.in
index 1699492a0..848917842 100644
--- a/CTestCustom.cmake.in
+++ b/CTestCustom.cmake.in
@@ -81,6 +81,7 @@ list(APPEND CTEST_CUSTOM_WARNING_EXCEPTION
   "index_encoder.c.241.2. warning: Value stored to .out_start. is never read"
   "index.c.*warning: Access to field.*results in a dereference of a null pointer.*loaded from variable.*"
   "cm_sha2.*warning: Value stored to.*is never read"
+  "cmFortranLexer.cxx:[0-9]+:[0-9]+: warning: Call to 'realloc' has an allocation size of 0 bytes"
   "testProcess.*warning: Dereference of null pointer .loaded from variable .invalidAddress.."
   "liblzma/simple/x86.c:[0-9]+:[0-9]+: warning: The result of the '<<' expression is undefined"
   "libuv/src/.*:[0-9]+:[0-9]+: warning: Dereference of null pointer"