diff --git a/experimental/webgpu/command_buffer.c b/experimental/webgpu/command_buffer.c
index b5d783d..84af3a1 100644
--- a/experimental/webgpu/command_buffer.c
+++ b/experimental/webgpu/command_buffer.c
@@ -746,7 +746,8 @@
   if (IREE_UNLIKELY(offset + values_length >=
                     sizeof(command_buffer->state.push_constants))) {
     return iree_make_status(IREE_STATUS_INVALID_ARGUMENT,
-                            "push constant range %zu (length=%zu) out of range",
+                            "push constant range %" PRIhsz " (length=%" PRIhsz
+                            ") out of range",
                             offset, values_length);
   }