diff --git a/forkstat.c b/forkstat.c
index 57dc9c8..4b22c42 100644
--- a/forkstat.c
+++ b/forkstat.c
@@ -40,6 +40,7 @@
 #include <time.h>
 #include <getopt.h>
 #include <sched.h>
+#include <pthread.h>
 #include <pwd.h>
 
 #include <sys/ioctl.h>
@@ -2022,7 +2023,7 @@ int main(int argc, char * const argv[])
 
 		(void)memset(&param, 0, sizeof(param));
 		param.sched_priority = max_prio;
-		if (sched_setscheduler(getpid(), policy, &param) < 0) {
+		if (pthread_setschedparam(pthread_self(), policy, &param) < 0) {
 			(void)fprintf(stderr, "sched_setscheduler failed: errno=%d (%s)\n",
 				errno, strerror(errno));
 			goto abort_sock;