diff --git a/Applications/Debugger/main.cpp b/Applications/Debugger/main.cpp
index dc198841c8..4829c52b0d 100644
--- a/Applications/Debugger/main.cpp
+++ b/Applications/Debugger/main.cpp
@@ -56,7 +56,7 @@ static void handle_sigint(int)
     g_debug_session = nullptr;
 }
 
-void handle_print_registers(const PtraceRegisters& regs)
+static void handle_print_registers(const PtraceRegisters& regs)
 {
     printf("eax: 0x%x\n", regs.eax);
     printf("ecx: 0x%x\n", regs.ecx);
@@ -70,7 +70,7 @@ void handle_print_registers(const PtraceRegisters& regs)
     printf("eflags: 0x%x\n", regs.eflags);
 }
 
-bool handle_disassemble_command(const String& command, void* first_instruction)
+static bool handle_disassemble_command(const String& command, void* first_instruction)
 {
     (void)demangle("foo");
     auto parts = command.split(' ');
@@ -110,7 +110,7 @@ bool handle_disassemble_command(const String& command, void* first_instruction)
     return true;
 }
 
-bool handle_breakpoint_command(const String& command)
+static bool handle_breakpoint_command(const String& command)
 {
     auto parts = command.split(' ');
     if (parts.size() != 2)
@@ -158,7 +158,7 @@ bool handle_breakpoint_command(const String& command)
     return true;
 }
 
-void print_help()
+static void print_help()
 {
     printf("Options:\n"
            "cont - Continue execution\n"
diff --git a/Applications/Terminal/main.cpp b/Applications/Terminal/main.cpp
index 8b1177f7b2..696e4e3cf9 100644
--- a/Applications/Terminal/main.cpp
+++ b/Applications/Terminal/main.cpp
@@ -134,7 +134,7 @@ static void run_command(int ptm_fd, String command)
     }
 }
 
-RefPtr<GUI::Window> create_settings_window(TerminalWidget& terminal)
+static RefPtr<GUI::Window> create_settings_window(TerminalWidget& terminal)
 {
     auto window = GUI::Window::construct();
     window->set_title("Terminal Settings");
diff --git a/Applications/Welcome/main.cpp b/Applications/Welcome/main.cpp
index c2122f1bae..fe0ed62fd1 100644
--- a/Applications/Welcome/main.cpp
+++ b/Applications/Welcome/main.cpp
@@ -53,7 +53,7 @@ struct ContentPage {
     Vector<String> content;
 };
 
-Optional<Vector<ContentPage>> parse_welcome_file(const String& path)
+static Optional<Vector<ContentPage>> parse_welcome_file(const String& path)
 {
     const auto error = Optional<Vector<ContentPage>>();
     auto file = Core::File::construct(path);