diff --git a/tp/tp5/src/pi.c b/tp/tp5/src/pi.c
index 00b463a..da72ad5 100644
--- a/tp/tp5/src/pi.c
+++ b/tp/tp5/src/pi.c
@@ -4,7 +4,7 @@
 #include<signal.h>
 #include<stdint.h>
 #include<assert.h>
-
+#include <time.h>
 double tstamp(void) {                                                                                    
 	struct timespec tv;
 	clock_gettime(CLOCK_REALTIME, &tv);