diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index 8e71eda..9d7d69a 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -88,7 +88,7 @@
  * This proc is used in start_up.c
  * So it isn't 'static'.
  */
-int create_tmp_file(unsigned long len)
+int create_tmp_file(unsigned long long len)
 {
 	int fd, err;
 	char zero;
@@ -121,7 +121,7 @@
 	return(fd);
 }
 
-static int create_anon_file(unsigned long len)
+static int create_anon_file(unsigned long long len)
 {
 	void *addr;
 	int fd;
@@ -144,7 +144,7 @@
 
 extern int have_devanon;
 
-int create_mem_file(unsigned long len)
+int create_mem_file(unsigned long long len)
 {
 	int err, fd;
 
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 553a09c..37517d4 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -296,7 +296,7 @@
 	check_sysemu();
 }
 
-extern int create_tmp_file(unsigned long len);
+extern int create_tmp_file(unsigned long long len);
 
 static void check_tmpexec(void)
 {