diff --git a/build.windows.ps1 b/build.windows.ps1
index 2c024594..013c1e76 100644
--- a/build.windows.ps1
+++ b/build.windows.ps1
@@ -75,6 +75,7 @@ Push-Location $WEBRTC_DIR
     git apply --ignore-whitespace -p 2 $PATCH_DIR\add_licenses.patch
     git apply --ignore-whitespace -p 2 $PATCH_DIR\windows_fix_towupper.patch
     git apply --ignore-whitespace $PATCH_DIR\windows_fix_abseil.patch
+    git apply --ignore-whitespace $PATCH_DIR\windows_fix_optional.patch
   Pop-Location
 Pop-Location
 
diff --git a/patch/windows_fix_optional.patch b/patch/windows_fix_optional.patch
new file mode 100644
index 00000000..ebb0b889
--- /dev/null
+++ b/patch/windows_fix_optional.patch
@@ -0,0 +1,10 @@
+--- a/rtc_base/ssl_stream_adapter.h
++++ b/rtc_base/ssl_stream_adapter.h
+@@ -15,6 +15,7 @@
+ #include <stdint.h>
+ 
+ #include <memory>
++#include <optional>
+ #include <string>
+ #include <vector>
+