diff --git a/gc.c b/gc.c
index 494da26..ecadfd8 100644
--- a/gc.c
+++ b/gc.c
@@ -1002,6 +1002,7 @@ static void _fprint_value(FILE *f, value_t v, seen_value_t *seen)
   else if (is_byte_string(v))
   {
     byte_string_t *str = _get_byte_string(v);
+    size_t written = 0;
 
     fputc('"', f);
 
@@ -1010,11 +1011,17 @@ static void _fprint_value(FILE *f, value_t v, seen_value_t *seen)
       int ch = str->bytes[i];
 
       if (isprint(ch) && (ch != '\\') && (ch != '\"'))
+      {
         fputc(str->bytes[i], f);
+        ++written;
+      }
       else
+      {
         fprintf(f, "\\x%.2X", (int)str->bytes[i]);
+        written += 4;
+      }
 
-      if (i >= 20)
+      if (written >= 20)
       {
         fputs("...", f);
         break;
diff --git a/interp.c b/interp.c
index 03f9d2a..bc954a7 100644
--- a/interp.c
+++ b/interp.c
@@ -88,11 +88,13 @@ value_t run_interpreter(value_t lambda, value_t argv)
      */
 
 #if 0
-    fprint_value(stderr, state.lambda.value); fputc('\n', stderr);
-    fprint_value(stderr, state.argv.value);   fputc('\n', stderr);
-    fprint_value(stderr, state.k.value);      fputc('\n', stderr);
-    fprint_value(stderr, state.ctx.value);    fputc('\n', stderr);
+    fflush(stdout);
+    fputs("LAMBDA:  ", stderr); fprint_value(stderr, state.lambda.value); fputc('\n', stderr);
+    fputs("ARGLIST: ", stderr); fprint_value(stderr, state.argv.value);   fputc('\n', stderr);
+    fputs("CONT'N:  ", stderr); fprint_value(stderr, state.k.value);      fputc('\n', stderr);
+    fputs("CONTEXT: ", stderr); fprint_value(stderr, state.ctx.value);    fputc('\n', stderr);
     fputc('\n', stderr);
+    fflush(stderr);
 #endif
 
     if (is_builtin_fn(state.lambda.value))