diff --git a/sycl/include/sycl/ext/intel/experimental/pipes.hpp b/sycl/include/sycl/ext/intel/experimental/pipes.hpp
index 4313673f49082..b7f912183439c 100644
--- a/sycl/include/sycl/ext/intel/experimental/pipes.hpp
+++ b/sycl/include/sycl/ext/intel/experimental/pipes.hpp
@@ -69,7 +69,7 @@ class pipe_base {
 #ifdef __SYCL_PIPES_CPP
 // Magic combination found by trial and error:
 __SYCL_EXPORT
-#ifdef WIN32
+#if _WIN32
 inline
 #endif
 #else
diff --git a/sycl/include/sycl/ext/oneapi/experimental/graph.hpp b/sycl/include/sycl/ext/oneapi/experimental/graph.hpp
index ca30b8125a5ae..c24cd976afe5c 100644
--- a/sycl/include/sycl/ext/oneapi/experimental/graph.hpp
+++ b/sycl/include/sycl/ext/oneapi/experimental/graph.hpp
@@ -388,7 +388,7 @@ class __SYCL_EXPORT modifiable_command_graph {
 #ifdef __SYCL_GRAPH_IMPL_CPP
 // Magic combination found by trial and error:
 __SYCL_EXPORT
-#if WIN32
+#if _WIN32
 inline
 #endif
 #else