diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8acc84cf..80ffac41 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -250,6 +250,10 @@ else()
         target_sources(usb-1.0 PRIVATE
             "${LIBUSB_ROOT}/os/openbsd_usb.c"
         )
+    elseif(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
+        target_sources(usb-1.0 PRIVATE
+            "${LIBUSB_ROOT}/os/sunos_usb.c"
+        )
     elseif(EMSCRIPTEN)
         target_sources(usb-1.0 PRIVATE
             "${LIBUSB_ROOT}/os/emscripten_webusb.cpp"