diff --git a/tests/lib/cpp/cxx/testcase.yaml b/tests/lib/cpp/cxx/testcase.yaml
index e9fc90855c4..8535faf9c30 100644
--- a/tests/lib/cpp/cxx/testcase.yaml
+++ b/tests/lib/cpp/cxx/testcase.yaml
@@ -35,7 +35,8 @@ tests:
   cpp.main.cpp98:
     arch_exclude: posix
     # Exclude nRF54L series, nRF54H20 and nRF9280 as Nordic HAL is not compatible with C++98.
-    # Exclude CONFIG_HAS_RENESAS_RA_FSP as Renesas RA HAL is not compatible with C++98.
+    # Exclude CONFIG_HAS_RENESAS_RA_FSP and CONFIG_HAS_RENESAS_RZ_FSP as Renesas HALs are not
+    # compatible with C++98.
     platform_exclude:
       - nrf54l15dk/nrf54l05/cpuapp
       - nrf54l15dk/nrf54l10/cpuapp
@@ -45,7 +46,7 @@ tests:
       - nrf54h20dk/nrf54h20/cpurad
       - nrf9280pdk/nrf9280/cpuapp
       - nrf9280pdk/nrf9280/cpurad
-    filter: not CONFIG_HAS_RENESAS_RA_FSP
+    filter: not CONFIG_HAS_RENESAS_RA_FSP and not CONFIG_HAS_RENESAS_RZ_FSP
     build_only: true
     extra_configs:
       - CONFIG_STD_CPP98=y