diff --git a/examples/set_maps.c b/examples/set_maps.c
index b4916cf..e88cd42 100644
--- a/examples/set_maps.c
+++ b/examples/set_maps.c
@@ -143,8 +143,8 @@
   }
   assert(encoder != NULL);
   info.codec_fourcc = encoder->fourcc;
-  info.frame_width = strtol(argv[2], NULL, 0);
-  info.frame_height = strtol(argv[3], NULL, 0);
+  info.frame_width = (int)strtol(argv[2], NULL, 0);
+  info.frame_height = (int)strtol(argv[3], NULL, 0);
   info.time_base.numerator = 1;
   info.time_base.denominator = fps;