diff --git a/ext/src/dll/CMakeLists.txt b/ext/src/dll/CMakeLists.txt
index 109000ea3e..687d55e01f 100644
--- a/ext/src/dll/CMakeLists.txt
+++ b/ext/src/dll/CMakeLists.txt
@@ -27,13 +27,11 @@ target_link_libraries(
                             opentelemetry_exporter_ostream_metrics)
 
 if(WITH_OTLP_GRPC)
-  add_compile_definitions(WITH_OTLP_GRPC)
   target_link_libraries(opentelemetry_cpp
                         PRIVATE opentelemetry_exporter_otlp_grpc_metrics)
 endif()
 
 if(WITH_OTLP_HTTP)
-  add_compile_definitions(WITH_OTLP_HTTP)
   target_link_libraries(opentelemetry_cpp
                         PRIVATE opentelemetry_exporter_otlp_http_metric)
 endif()