diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4173381ac..7e286bff2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,7 +58,9 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_EXTENSIONS OFF)
 
-if(NOT MSVC)
+if(MSVC)
+  add_compile_options("/W3")
+else()
   add_compile_options(
     -Wall -Wextra -Wmissing-declarations -Wmissing-prototypes
     -Wstrict-prototypes -Wbad-function-cast -Wnested-externs
diff --git a/src/pcp/request.c b/src/pcp/request.c
index 182ed926c..730234540 100644
--- a/src/pcp/request.c
+++ b/src/pcp/request.c
@@ -150,7 +150,7 @@ static void timeout(void *arg)
 	}
 
 	req->RT = RT_next(&req->conf, req->RT);
-	tmr_start(&req->tmr, req->RT * 1000, timeout, req);
+	tmr_start(&req->tmr, (uint64_t)req->RT * 1000, timeout, req);
 }
 
 
@@ -238,7 +238,7 @@ static int start_sending(struct pcp_request *req)
 		return err;
 
 	req->RT = RT_init(&req->conf);
-	tmr_start(&req->tmr, req->RT * 1000, timeout, req);
+	tmr_start(&req->tmr, (uint64_t)req->RT * 1000, timeout, req);
 
 	if (req->conf.mrd) {
 		tmr_start(&req->tmr_dur, req->conf.mrd * 1000,