diff --git a/Tests/RunCMake/IAR/RunCMakeTest.cmake b/Tests/RunCMake/IAR/RunCMakeTest.cmake
index 1d6bd4f439..8d1d308a75 100644
--- a/Tests/RunCMake/IAR/RunCMakeTest.cmake
+++ b/Tests/RunCMake/IAR/RunCMakeTest.cmake
@@ -67,10 +67,13 @@ foreach(_iar_toolchain IN LISTS _iar_toolchains)
     -DCMAKE_EXE_LINKER_FLAGS=${LINK_OPTS}
   )
 
-  run_toolchain(iar-asm
-    -DCMAKE_SYSTEM_NAME=Generic
-    -DCMAKE_ASM_COMPILER=${IAR_ASSEMBLER}
-  )
+  # FIXME(#26267): ASM tests fail on Windows.
+  if(NOT CMAKE_HOST_WIN32)
+    run_toolchain(iar-asm
+      -DCMAKE_SYSTEM_NAME=Generic
+      -DCMAKE_ASM_COMPILER=${IAR_ASSEMBLER}
+    )
+  endif()
 
   run_toolchain(iar-lib
     -DCMAKE_SYSTEM_NAME=Generic