diff --git a/TP3/Exo5/exo5_3.c b/TP3/Exo5/exo5_3.c
index 7568d71..250813f 100644
--- a/TP3/Exo5/exo5_3.c
+++ b/TP3/Exo5/exo5_3.c
@@ -5,6 +5,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 #include <math.h>
+#include <signal.h>
 
 #define SIZE 1000
 int search(const unsigned char *t, int start, int end, int n)