diff --git a/proc.h b/proc.h
index 22caa11..cb44e12 100644
--- a/proc.h
+++ b/proc.h
@@ -39,4 +39,4 @@ int parsestat(pid_t pid, struct procstat *ps);
 int parsestatus(pid_t pid, struct procstatus *pstatus);
 int proceuid(pid_t pid, uid_t *euid);
 int procuid(pid_t pid, uid_t *euid);
-int validps(const char *path);
+int pidfile(const char *file);
diff --git a/ps.c b/ps.c
index ef0935e..ffc2d6e 100644
--- a/ps.c
+++ b/ps.c
@@ -13,7 +13,7 @@
 
 static void usage(void);
 static void psout(struct procstat *ps);
-static void psr(const char *path);
+static void psr(const char *file);
 
 enum {
 	PS_aflag = 1 << 0,
@@ -155,14 +155,14 @@ psout(struct procstat *ps)
 }
 
 static void
-psr(const char *path)
+psr(const char *file)
 {
 	struct procstat ps;
 	pid_t pid;
 
-	if (!validps(path))
+	if (!pidfile(file))
 		return;
-	pid = estrtol(path, 10);
+	pid = estrtol(file, 10);
 	parsestat(pid, &ps);
 	psout(&ps);
 }
diff --git a/util/proc.c b/util/proc.c
index 7924aab..cb6a8f9 100644
--- a/util/proc.c
+++ b/util/proc.c
@@ -95,12 +95,12 @@ parsestatus(pid_t pid, struct procstatus *pstatus)
 }
 
 int
-validps(const char *path)
+pidfile(const char *file)
 {
 	char *end;
 
 	errno = 0;
-	strtol(path, &end, 10);
+	strtol(file, &end, 10);
 	if (*end != '\0')
 		return 0;
 	if (errno != 0)