diff --git a/mongoose.c b/mongoose.c
index 0ec25588..073d7e0e 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -588,7 +588,7 @@ const char *mg_version(void) {
   return MONGOOSE_VERSION;
 }
 
-void mg_strlcpy(register char *dst, register const char *src, size_t n) {
+static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
   for (; *src != '\0' && n > 1; n--) {
     *dst++ = *src++;
   }
@@ -599,7 +599,7 @@ static int lowercase(const char *s) {
   return tolower(* (const unsigned char *) s);
 }
 
-int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
+static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
   int diff = 0;
 
   if (len > 0)
@@ -610,7 +610,7 @@ int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
   return diff;
 }
 
-int mg_strcasecmp(const char *s1, const char *s2) {
+static int mg_strcasecmp(const char *s1, const char *s2) {
   int diff;
 
   do {
@@ -620,7 +620,7 @@ int mg_strcasecmp(const char *s1, const char *s2) {
   return diff;
 }
 
-char * mg_strndup(const char *ptr, size_t len) {
+static char * mg_strndup(const char *ptr, size_t len) {
   char *p;
 
   if ((p = (char *) malloc(len + 1)) != NULL) {
@@ -630,7 +630,7 @@ char * mg_strndup(const char *ptr, size_t len) {
   return p;
 }
 
-char * mg_strdup(const char *str) {
+static char * mg_strdup(const char *str) {
   return mg_strndup(str, strlen(str));
 }
 
diff --git a/mongoose.h b/mongoose.h
index 3c3a33c4..33c2e495 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -255,14 +255,6 @@ int mg_start_thread(mg_thread_func_t f, void *p);
 const char *mg_get_builtin_mime_type(const char *file_name);
 
 
-// Platform independent string utility functions.
-void mg_strlcpy(char *dst, const char *src, size_t n);
-int mg_strncasecmp(const char *s1, const char *s2, size_t len);
-int mg_strcasecmp(const char *s1, const char *s2);
-char *mg_strndup(const char *ptr, size_t len);
-char *mg_strdup(const char *str);
-
-
 // Return Mongoose version.
 const char *mg_version(void);