diff --git a/.gitlab/ci/iar-env.sh b/.gitlab/ci/iar-env.sh
index 9bf0672c24047f567f81a2a4e039da9586db4dc2..29246a1f1e70af287f23c45a24b1da12ee37d281 100644
--- a/.gitlab/ci/iar-env.sh
+++ b/.gitlab/ci/iar-env.sh
@@ -1,8 +1,7 @@
-# FIXME(#26249): Testing fails with RH850 tooling.
-# bxrh850-3.10.2.deb
 files='
 bxarm-9.50.2.deb
 bxavr-8.10.2.deb
+bxrh850-3.10.2.deb
 bxriscv-3.30.1.deb
 bxrl78-5.10.3.deb
 bxrx-5.10.1.deb
@@ -15,7 +14,7 @@ done
 echo '
 cb6a276ace472939fbb76fc5ce517149296ac2c87047b59504f9fe95aed81794  bxarm-9.50.2.deb
 4a1065291952a23a8bfbbaa4eb36ca49b0af8653b8faab34ce955d9d48d64506  bxavr-8.10.2.deb
-#b14085a0f21750c58168125d3cece2e3fcbd4c6495c652b5e65b6637bac0ac31  bxrh850-3.10.2.deb
+b14085a0f21750c58168125d3cece2e3fcbd4c6495c652b5e65b6637bac0ac31  bxrh850-3.10.2.deb
 517e18dffdd4345f97c480b5128c7feea25ec1c3f06e62d8e2e6808c401d514a  bxriscv-3.30.1.deb
 3deca7f6afd5f47684464ad748334ab0690097a109d9c680603450074fc32ccf  bxrl78-5.10.3.deb
 260e592c48cbaf902b13bdb2feeeba83068978131fcb5c027dab17e715dec7e7  bxrx-5.10.1.deb
diff --git a/Tests/RunCMake/IAR/RunCMakeTest.cmake b/Tests/RunCMake/IAR/RunCMakeTest.cmake
index 2fefa6a7dd859d47d81e887cb0d2bc79a111cd2d..b6dd4b3872145696f4f97762ba8578003333925a 100644
--- a/Tests/RunCMake/IAR/RunCMakeTest.cmake
+++ b/Tests/RunCMake/IAR/RunCMakeTest.cmake
@@ -38,6 +38,13 @@ foreach(_iar_toolchain IN LISTS _iar_toolchains)
       "--define_symbol _NEAR_CONST_LOCATION=0 "
       "--config ${TOOLKIT_DIR}/config/lnkrl78_s3.icf "
     )
+  elseif(ARCH STREQUAL "rh850")
+    string(CONCAT LINK_OPTS
+      "--config_def CSTACK_SIZE=0x1000 "
+      "--config_def HEAP_SIZE=0x1000 "
+      "--config_def _SELF_SIZE=0x20000 "
+      "--config ${TOOLKIT_DIR}/config/lnkr7f701401.icf "
+    )
   else()
     set(LINK_OPTS "")
   endif()