diff --git a/worldgen-c/bin/worldgen b/worldgen-c/bin/worldgen
index 33d4094..d2fa696 100755
Binary files a/worldgen-c/bin/worldgen and b/worldgen-c/bin/worldgen differ
diff --git a/worldgen-c/src/main.c b/worldgen-c/src/main.c
index ee60e1a..574a672 100644
--- a/worldgen-c/src/main.c
+++ b/worldgen-c/src/main.c
@@ -769,6 +769,13 @@ int main(int argc, char **argv) {
 		snow_line = sea_level + 38;
 	}
 
+	if (!have_rect) {
+		min_x = center_x - radius;
+		max_x = center_x + radius;
+		min_z = center_z - radius;
+		max_z = center_z + radius;
+	}
+
 	/* Global prepass: compute trails based on target area before threading */
 	worldgen_init(&pre_ctx, world_seed, sea_level, snow_line);
 	pre_ctx.enable_trails = enable_trails;
@@ -781,13 +788,6 @@ int main(int argc, char **argv) {
 		prepass_ready = 1;
 	}
 
-	if (!have_rect) {
-		min_x = center_x - radius;
-		max_x = center_x + radius;
-		min_z = center_z - radius;
-		max_z = center_z + radius;
-	}
-
 	if (ensure_dir(out_dir) != 0) {
 		fprintf(stderr, "Failed to create output directory: %s\n", out_dir);
 		return 1;