diff --git a/libc-test/semver/windows.txt b/libc-test/semver/windows.txt
index 1f66d622eb5c3..5f1c97b8e4c68 100644
--- a/libc-test/semver/windows.txt
+++ b/libc-test/semver/windows.txt
@@ -148,6 +148,7 @@ abs
 accept
 access
 aligned_malloc
+aligned_free
 atexit
 atof
 atoi
diff --git a/src/windows/mod.rs b/src/windows/mod.rs
index ad0dc77d23193..1b5de0bacb4a0 100644
--- a/src/windows/mod.rs
+++ b/src/windows/mod.rs
@@ -492,6 +492,8 @@ extern "C" {
     pub fn wsetlocale(category: ::c_int, locale: *const wchar_t) -> *mut wchar_t;
     #[link_name = "_aligned_malloc"]
     pub fn aligned_malloc(size: size_t, alignment: size_t) -> *mut c_void;
+    #[link_name = "_aligned_free"]
+    pub fn aligned_free(ptr: *mut ::c_void);
 }
 
 extern "system" {