diff --git a/yjit_core.c b/yjit_core.c
index a3b52971fb..fbe855d04b 100644
--- a/yjit_core.c
+++ b/yjit_core.c
@@ -1319,7 +1319,7 @@ invalidate_block_version(block_t *block)
         regenerate_branch(cb, branch);
 
         if (target_next && branch->end_addr > block->end_addr) {
-            fprintf(stderr, "branch_block_idx=%u block_idx=%u over=%ld block_size=%ld\n",
+            fprintf(stderr, "branch_block_idx=%u block_idx=%u over=%td block_size=%td\n",
                 branch->block->blockid.idx,
                 block->blockid.idx,
                 branch->end_addr - block->end_addr,
diff --git a/yjit_iface.c b/yjit_iface.c
index 9240e3f1c9..339c5cd455 100644
--- a/yjit_iface.c
+++ b/yjit_iface.c
@@ -1180,7 +1180,8 @@ rb_yjit_call_threshold(void)
     return rb_yjit_opts.call_threshold;
 }
 
-# define PTR2NUM(x)   (LONG2NUM((long)(x)))
+/* assume sizeof(void*) == sizeof(size_t) */
+# define PTR2NUM(x)   (SSIZET2NUM((ssize_t)(x)))
 
 /**
  *  call-seq: block.id -> unique_id