diff --git a/src/_win/cookie.c b/src/_win/cookie.c
index 1f3b009..2833bf5 100644
--- a/src/_win/cookie.c
+++ b/src/_win/cookie.c
@@ -1,7 +1,7 @@
 
 u64 __security_cookie;
 
-void __security_init_cookie() {
+static void __security_init_cookie() {
     // They say it's a random number so I generated
     // one using numbergenerator.org
     __security_cookie = 0xb26e04cc62ba48a;
diff --git a/src/_win/heap.c b/src/_win/heap.c
index 1f15451..b0f0366 100644
--- a/src/_win/heap.c
+++ b/src/_win/heap.c
@@ -9,7 +9,7 @@ static intptr_t align_forward(intptr_t p, size_t a) {
     return (p+a-1)&~(a-1);
 }
 
-void _setup_heap() {
+static void _setup_heap() {
     heap_handle = GetProcessHeap();
     if (heap_handle == NULL) {
         ExitProcess(-42069);
diff --git a/src/_win/signal.c b/src/_win/signal.c
index 91f53d9..0298799 100644
--- a/src/_win/signal.c
+++ b/src/_win/signal.c
@@ -42,7 +42,7 @@ static LONG _win32_handler(EXCEPTION_POINTERS *ExceptionInfo) {
 }
 
 
-void _setup_eh() {
+static void _setup_eh() {
     void *res = AddVectoredExceptionHandler(1, &_win32_handler);
     if(res == NULL) {
         ExitProcess(-69420);
diff --git a/src/_win/stdio.c b/src/_win/stdio.c
index f170fb9..c2d2be7 100644
--- a/src/_win/stdio.c
+++ b/src/_win/stdio.c
@@ -109,7 +109,7 @@ static inline void delete_stream(FILE *stream) {
     mtx_destroy(&lock);
 }
 
-void _setup_io() {
+static void _setup_io() {
     HANDLE hstdout = GetStdHandle(STD_OUTPUT_HANDLE);
     HANDLE hstderr = GetStdHandle(STD_ERROR_HANDLE);
     HANDLE hstdin  = GetStdHandle(STD_INPUT_HANDLE);
@@ -254,7 +254,7 @@ int fclose(FILE *stream) {
     return 0;
 }
 
-void _close_io() {
+static void _close_io() {
     while(streams_to_close != NULL) {
         FILE *stream = streams_to_close;
         fflush(stream);
diff --git a/src/_win/time.c b/src/_win/time.c
index 6303159..022ec01 100644
--- a/src/_win/time.c
+++ b/src/_win/time.c
@@ -12,7 +12,7 @@
 static uint64_t timer_freq;
 static uint64_t timer_start;
 
-void _setup_timer(void) {
+static void _setup_timer(void) {
     LARGE_INTEGER freq, start;
     QueryPerformanceFrequency(&freq);
     QueryPerformanceCounter(&start);
diff --git a/src/_win/win.h b/src/_win/win.h
index 9daefb1..1f24001 100644
--- a/src/_win/win.h
+++ b/src/_win/win.h
@@ -7,9 +7,9 @@
 #include <DbgHelp.h>
 #include <winternl.h>
 
-void _setup_timer(void);
-void _setup_eh();
-void _setup_heap();
-void _setup_io();
-void _close_io();
-void __security_init_cookie();
\ No newline at end of file
+static void _setup_timer(void);
+static void _setup_eh();
+static void _setup_heap();
+static void _setup_io();
+static void _close_io();
+static void __security_init_cookie();
\ No newline at end of file