diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index b65c547855..f9d2e1e5e7 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -107,7 +107,7 @@ endif()
 
 # silence excessive warnings for new Intel Compilers
 if(CMAKE_CXX_COMPILER_ID STREQUAL "IntelLLVM")
-  set(CMAKE_TUNE_DEFAULT "-Wno-tautological-constant-compare")
+  set(CMAKE_TUNE_DEFAULT "-Wno-tautological-constant-compare -Wno-unused-command-line-argument")
 endif()
 
 # silence excessive warnings for PGI/NVHPC compilers
diff --git a/unittest/CMakeLists.txt b/unittest/CMakeLists.txt
index 747c851503..0b2f3bde83 100644
--- a/unittest/CMakeLists.txt
+++ b/unittest/CMakeLists.txt
@@ -12,6 +12,9 @@ mark_as_advanced(GTEST_MD5)
 set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 
 include(ExternalCMakeProject)
+if(CMAKE_CXX_COMPILER_ID STREQUAL "IntelLLVM")
+  set(cxx_strict_flags "-Wno-error -Wno-unused-command-line-argument")
+endif()
 set(INSTALL_GTEST OFF CACHE BOOL "" FORCE)
 set(INSTALL_GMOCK OFF CACHE BOOL "" FORCE)
 ExternalCMakeProject(googletest ${GTEST_URL} ${GTEST_MD5} googletest . "")