diff --git a/src/starter/confread.h b/src/starter/confread.h
index 988b8ed48..9cb919ce5 100644
--- a/src/starter/confread.h
+++ b/src/starter/confread.h
@@ -198,12 +198,12 @@ struct starter_config {
 				char     *plutostderrlog;
 				bool     uniqueids;
 				u_int    overridemtu;
-				u_int    crlcheckinterval;
+				time_t   crlcheckinterval;
 				bool     cachecrls;
 				strict_t strictcrlpolicy;
 				bool     nocrsend;
 				bool     nat_traversal;
-				u_int    keep_alive;
+				time_t   keep_alive;
 				u_int    force_keepalive;
 				char     *virtual_private;
 				char     *pkcs11module;
diff --git a/src/starter/invokepluto.c b/src/starter/invokepluto.c
index 11c13abe2..70c0692ea 100644
--- a/src/starter/invokepluto.c
+++ b/src/starter/invokepluto.c
@@ -184,7 +184,7 @@ starter_start_pluto (starter_config_t *cfg, bool no_fork, bool attach_gdb)
 		static char buf1[15];
 
 		arg[argc++] = "--crlcheckinterval";
-		snprintf(buf1, sizeof(buf1), "%u", cfg->setup.crlcheckinterval);
+		snprintf(buf1, sizeof(buf1), "%d", (int)cfg->setup.crlcheckinterval);
 		arg[argc++] = buf1;
 	}
 	if (cfg->setup.cachecrls)
@@ -212,7 +212,7 @@ starter_start_pluto (starter_config_t *cfg, bool no_fork, bool attach_gdb)
 		static char buf2[15];
 
 		arg[argc++] = "--keep_alive";
-		snprintf(buf2, sizeof(buf2), "%u", cfg->setup.keep_alive);
+		snprintf(buf2, sizeof(buf2), "%d", (int)cfg->setup.keep_alive);
 		arg[argc++] = buf2;
 	}
 	if (cfg->setup.virtual_private)