diff --git a/updater/install.cpp b/updater/install.cpp
index 11d5215..3e7e928 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -79,8 +79,7 @@
     fprintf(stderr, "%s", buffer.c_str());
 }
 
-__attribute__((__format__(printf, 2, 3))) __nonnull((2))
-void uiPrintf(State* state, const char* format, ...) {
+void uiPrintf(State* _Nonnull state, const char* _Nonnull format, ...) {
     std::string error_msg;
 
     va_list ap;
diff --git a/updater/install.h b/updater/install.h
index 70e3434..b3b8a4d 100644
--- a/updater/install.h
+++ b/updater/install.h
@@ -20,8 +20,8 @@
 void RegisterInstallFunctions();
 
 // uiPrintf function prints msg to screen as well as logs
-void uiPrintf(State* state, const char* format, ...);
+void uiPrintf(State* _Nonnull state, const char* _Nonnull format, ...) __attribute__((__format__(printf, 2, 3)));
 
-static int make_parents(char* name);
+static int make_parents(char* _Nonnull name);
 
 #endif