diff --git a/compiler-rt/lib/builtins/emutls.c b/compiler-rt/lib/builtins/emutls.c
--- a/compiler-rt/lib/builtins/emutls.c
+++ b/compiler-rt/lib/builtins/emutls.c
@@ -123,7 +123,7 @@
 #include <assert.h>
 #include <malloc.h>
 #include <stdio.h>
-#include <windows.h>
+#include <Windows.h>
 
 static LPCRITICAL_SECTION emutls_mutex;
 static DWORD emutls_tls_index = TLS_OUT_OF_INDEXES;
diff --git a/compiler-rt/lib/builtins/enable_execute_stack.c b/compiler-rt/lib/builtins/enable_execute_stack.c
--- a/compiler-rt/lib/builtins/enable_execute_stack.c
+++ b/compiler-rt/lib/builtins/enable_execute_stack.c
@@ -19,7 +19,7 @@
 
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
-#include <windows.h>
+#include <Windows.h>
 #else
 #ifndef __APPLE__
 #include <unistd.h>