diff --git a/config.mk b/config.mk
index f555812..0c96010 100644
--- a/config.mk
+++ b/config.mk
@@ -16,7 +16,7 @@ INCS+= `pkg-config --cflags libnotify`
 LIBS+= `pkg-config --libs libnotify`
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\"
+CPPFLAGS = -DVERSION=\"${VERSION}\" -D_POSIX_C_SOURCE
 CFLAGS += -g -std=c99 -pedantic -Wall -Os ${INCS} ${DEFS} ${CPPFLAGS}
 LDFLAGS += -g ${LIBS}
 
diff --git a/spt.c b/spt.c
index e1d5e7e..21744d7 100644
--- a/spt.c
+++ b/spt.c
@@ -108,6 +108,7 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
+	sigset_t *emptymask = 0;
 	suspend = 0;
 
 	ARGBEGIN {
@@ -135,7 +136,7 @@ main(int argc, char *argv[])
 		timecount = 0;
 		while (timecount < timers[i].tmr)
 			if (suspend)
-				pause();
+				sigsuspend(emptymask);
 			else {
 				sleep(1);
 				timecount++;