diff --git a/ui.cpp b/ui.cpp
index a796461..9194ae3 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -240,7 +240,7 @@
 }
 
 void* RecoveryUI::time_key_helper(void* cookie) {
-    key_timer_t* info = (key_timer_t*) cookie;
+    key_timer_t* info = static_cast<key_timer_t*>(cookie);
     info->ui->time_key(info->key_code, info->count);
     delete info;
     return nullptr;
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 12ca151..db5fcc8 100644
--- a/updater/blockimg.cpp
+++ b/updater/blockimg.cpp
@@ -356,7 +356,7 @@
 }
 
 static void* unzip_new_data(void* cookie) {
-    NewThreadInfo* nti = (NewThreadInfo*) cookie;
+    NewThreadInfo* nti = static_cast<NewThreadInfo*>(cookie);
     ProcessZipEntryContents(nti->za, &nti->entry, receive_new_data, nti);
     return nullptr;
 }
diff --git a/wear_touch.cpp b/wear_touch.cpp
index cf33daa..e2ab44d 100644
--- a/wear_touch.cpp
+++ b/wear_touch.cpp
@@ -118,7 +118,7 @@
 }
 
 void* WearSwipeDetector::touch_thread(void* cookie) {
-    ((WearSwipeDetector*)cookie)->run();
+    (static_cast<WearSwipeDetector*>(cookie))->run();
     return NULL;
 }