diff --git a/src/nvim/os/time.h b/src/nvim/os/time.h
index 3a6b665b51..ad4886446a 100644
--- a/src/nvim/os/time.h
+++ b/src/nvim/os/time.h
@@ -5,7 +5,7 @@
 #include <stdbool.h>
 #include <time.h>
 
-typedef time_t Timestamp;
+typedef uint64_t Timestamp;
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "os/time.h.generated.h"