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-rw-r--r--src/options.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/options.c b/src/options.c
index a77c163..4d1e527 100644
--- a/src/options.c
+++ b/src/options.c
@@ -838,7 +838,7 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
opt.use_conversion_cache = 0;
break;
case OPTION_window_id:
- opt.x11_windowid = atol(optarg);
+ opt.x11_windowid = strtol(optarg, NULL, 0);
break;
case OPTION_zoom_step:
opt.zoom_rate = atof(optarg);