diff --git a/src/core/support/cpu_windows.c b/src/core/support/cpu_windows.c
index 4f7103d2828..f56bab3f8b4 100644
--- a/src/core/support/cpu_windows.c
+++ b/src/core/support/cpu_windows.c
@@ -34,7 +34,7 @@
 #include <grpc/support/port_platform.h>
 
 #ifdef GPR_WIN32
-#include <Windows.h>
+#include <windows.h>
 #include <grpc/support/log.h>
 
 unsigned gpr_cpu_num_cores(void) {