diff --git a/chmod.c b/chmod.c
index 2436721..f7ab866 100644
--- a/chmod.c
+++ b/chmod.c
@@ -8,7 +8,7 @@ static char  *modestr = "";
 static mode_t mask    = 0;
 static int    ret     = 0;
 
-void
+static void
 chmodr(const char *path, int depth)
 {
 	struct stat st;
diff --git a/nl.c b/nl.c
index 7323859..1ea72ed 100644
--- a/nl.c
+++ b/nl.c
@@ -20,7 +20,7 @@ static size_t      startnum = 1;
 static size_t      incr = 1;
 static regex_t     preg;
 
-void
+static void
 nl(const char *name, FILE *fp)
 {
 	char *buf = NULL;
diff --git a/split.c b/split.c
index a5250c7..1401bfd 100644
--- a/split.c
+++ b/split.c
@@ -9,7 +9,7 @@
 
 static int base = 26, start = 'a';
 
-int
+static int
 itostr(char *str, int x, int n)
 {
 	str[n] = '\0';
@@ -22,7 +22,7 @@ itostr(char *str, int x, int n)
 	return 0;
 }
 
-FILE *
+static FILE *
 nextfile(FILE *f, char *buf, int plen, int slen)
 {
 	static int filecount = 0;
diff --git a/touch.c b/touch.c
index dc76cfb..ed87253 100644
--- a/touch.c
+++ b/touch.c
@@ -44,7 +44,7 @@ touch(const char *file)
 	touch(file);
 }
 
-time_t
+static time_t
 parsetime(char *str, time_t current)
 {
 	struct tm *cur, t;
diff --git a/wc.c b/wc.c
index ae6c1be..f3064a9 100644
--- a/wc.c
+++ b/wc.c
@@ -7,7 +7,7 @@ static int    wflag = 0;
 static char   cmode = 0;
 static size_t tc = 0, tl = 0, tw = 0;
 
-void
+static void
 output(const char *str, size_t nc, size_t nl, size_t nw)
 {
 	int noflags = !cmode && !lflag && !wflag;
@@ -24,7 +24,7 @@ output(const char *str, size_t nc, size_t nl, size_t nw)
 	putchar('\n');
 }
 
-void
+static void
 wc(FILE *fp, const char *str)
 {
 	int word = 0, rlen;