diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 1cfd7fee50..49227de7d8 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -142,7 +142,7 @@ else()
   if(DEFINED ASSEMBLY_SOURCE)
     if(EXISTS ${ASSEMBLY_SOURCE})
       message("Copying platform assembly files from ${ASSEMBLY_SOURCE} to ${CMAKE_CURRENT_BINARY_DIR}")
-      file(COPY ${ASSEMBLY_SOURCE}/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
+      file(COPY ${ASSEMBLY_SOURCE}/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR} NO_SOURCE_PERMISSIONS)
     else()
       message(STATUS "${ASSEMBLY_SOURCE} assembly files do not exist.")
     endif()