diff --git a/bolt/runtime/CMakeLists.txt b/bolt/runtime/CMakeLists.txt
--- a/bolt/runtime/CMakeLists.txt
+++ b/bolt/runtime/CMakeLists.txt
@@ -30,7 +30,7 @@
 install(TARGETS bolt_rt_instr DESTINATION lib)
 install(TARGETS bolt_rt_hugify DESTINATION lib)
 
-if (CMAKE_CXX_COMPILER_ID MATCHES ".*Clang.*")
+if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   add_library(bolt_rt_instr_osx STATIC
     instr.cpp
     ${CMAKE_CURRENT_BINARY_DIR}/config.h