diff --git a/pebble_tool/sdk/manager.py b/pebble_tool/sdk/manager.py
index 1fbf1f8..ec7e435 100644
--- a/pebble_tool/sdk/manager.py
+++ b/pebble_tool/sdk/manager.py
@@ -112,6 +112,21 @@ class SDKManager(object):
                 Requirements(sdk_info['requirements']).ensure_satisfied()
                 os.mkdir(os.path.join(self.sdk_dir, sdk_info['version']))
                 t.extractall(path)
+
+            print("Hackily patching headers...")
+            def hacky_patch(file_path):
+                if os.path.exists(file_path):
+                    with open(file_path, 'r') as f:
+                        data = f.read()
+                    data = data.replace('\nint strftime', '\nunsigned int strftime')
+                    with open(file_path, 'w') as f:
+                        f.write(data)
+            for entry in os.listdir(os.path.join(path, "sdk-core", "pebble")):
+                platform = os.path.join(path, "sdk-core", "pebble", entry)
+                if entry != 'common' and os.path.isdir(platform):
+                    hacky_patch(os.path.join(platform, "include", "pebble.h"))
+                    hacky_patch(os.path.join(platform, "include", "pebble_worker.h"))
+
             virtualenv_path = os.path.join(path, ".env")
             print("Preparing virtualenv... (this may take a while)")
             subprocess.check_call([sys.executable, "-m", "virtualenv", virtualenv_path])