diff --git a/cmake/onnxruntime_mlas.cmake b/cmake/onnxruntime_mlas.cmake
index ec593cb8e1..a3de6438d9 100644
--- a/cmake/onnxruntime_mlas.cmake
+++ b/cmake/onnxruntime_mlas.cmake
@@ -299,7 +299,7 @@ else()
               HAS_P10_RUNTIME
             )
             if (HAS_P10_RUNTIME)
-              set_source_files_properties(${mlas_common_srcs} PROPERTIES COMPILE_FLAGS "-DPOWER10")
+              set_source_files_properties(${MLAS_SRC_DIR}/platform.cpp PROPERTIES COMPILE_FLAGS "-DPOWER10")
             endif()
             set(mlas_platform_srcs_power10
               ${MLAS_SRC_DIR}/power/SgemmKernelPOWER10.cpp