diff --git a/daemon/UnixDaemon.cpp b/daemon/UnixDaemon.cpp
index 0c182afe..43c3c9de 100644
--- a/daemon/UnixDaemon.cpp
+++ b/daemon/UnixDaemon.cpp
@@ -178,8 +178,8 @@ namespace i2p
 					return false;
 				}
 
-				char pid[10];
-				sprintf(pid, "%d\n", getpid());
+				char pid[16];
+				snprintf(pid, 16, "%d\n", getpid());
 				ftruncate(pidFH, 0);
 				if (write(pidFH, pid, strlen(pid)) < 0)
 				{