diff --git a/src/render.cpp b/src/render.cpp
index 6b18a95..7d0d13b 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -154,11 +154,11 @@ void init_viewer(Arena *arena, App_State &app, u16 n_cols)
       String8 ntpl_desc = rntuple_description(scratch.arena, anchor->anchor);
       if (rntuple_is_old_version(anchor->anchor)) {
         viewer.col_title[0] = 1.f;
-        viewer.title = push_str8f(arena, "\"%s;%u\" (%s) from file \"%s\" ** old version, some data missing! **", 
+        viewer.title = push_str8f(arena, "\"%s;%hu\" (%s) from file \"%s\" ** old version, some data missing! **", 
                                   anchor->name.c(), anchor->cycle, ntpl_desc.c(), app.inspected_file.name.c());
       } else {
         viewer.col_title[0] = viewer.col_title[1] = viewer.col_title[2] = 1.f;
-        viewer.title = push_str8f(arena, "\"%s;%u\" (%s) from file \"%s\"", anchor->name.c(), anchor->cycle,
+        viewer.title = push_str8f(arena, "\"%s;%hu\" (%s) from file \"%s\"", anchor->name.c(), anchor->cycle,
                                   ntpl_desc.c(), app.inspected_file.name.c());
       }
     } else {
diff --git a/src/rntuple.cpp b/src/rntuple.cpp
index b16e8e2..a0261cb 100644
--- a/src/rntuple.cpp
+++ b/src/rntuple.cpp
@@ -243,7 +243,7 @@ RNTuple_Data get_rntuple_data(Arena *arena, const Inspected_File &file, const TF
     }
 
     const RNTuple_Anchor_Info *ntuple_info = (const RNTuple_Anchor_Info *)sec_anchor->info;
-    fprintf(stderr, "Loading pages from \"%s;%u\"...\n", ntuple_info->name.c(), ntuple_info->cycle);
+    fprintf(stderr, "Loading pages from \"%s;%hu\"...\n", ntuple_info->name.c(), ntuple_info->cycle);
 
     u64 clusters_first_idx = n_clusters;