diff --git a/toml.c b/toml.c
index 169172d..cad2657 100644
--- a/toml.c
+++ b/toml.c
@@ -1944,7 +1944,7 @@ int toml_rtots(toml_raw_t src_, toml_timestamp_t* ret)
 			char* qq;
 			p++;
 			errno = 0;
-			*millisec = strtol(p, &qq, 0);
+			*millisec = strtol(p, &qq, 10);
 			if (errno) {
 				return -1;
 			}