diff --git a/mrbgems/mruby-print/src/print.c b/mrbgems/mruby-print/src/print.c
index b74edc9c4..f6d6d46f0 100644
--- a/mrbgems/mruby-print/src/print.c
+++ b/mrbgems/mruby-print/src/print.c
@@ -15,33 +15,33 @@
 #endif
 #endif
 
-static void
-printstr(mrb_state *mrb, const char *p, mrb_int len)
-{
-#if defined(_WIN32)
-  if (isatty(fileno(stdout))) {
-    DWORD written;
-    int wlen = MultiByteToWideChar(CP_UTF8, 0, p, (int)len, NULL, 0);
-    wchar_t* utf16 = (wchar_t*)mrb_malloc(mrb, (wlen+1) * sizeof(wchar_t));
-    if (MultiByteToWideChar(CP_UTF8, 0, p, (int)len, utf16, wlen) > 0) {
-      utf16[wlen] = 0;
-      WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE),
-                    utf16, (DWORD)wlen, &written, NULL);
-    }
-    mrb_free(mrb, utf16);
-  } else
-#endif
-    fwrite(p, (size_t)len, 1, stdout);
-  fflush(stdout);
-}
-
 static mrb_value
 mrb_printstr(mrb_state *mrb, mrb_value self)
 {
   mrb_value s = mrb_get_arg1(mrb);
 
   if (mrb_string_p(s)) {
-    printstr(mrb, RSTRING_PTR(s), RSTRING_LEN(s));
+    const char *p = RSTRING_PTR(s);
+    mrb_int len = RSTRING_LEN(s);
+
+#if defined(_WIN32)
+    if (isatty(fileno(stdout))) {
+      DWORD written;
+      int wlen = MultiByteToWideChar(CP_UTF8, 0, p, (int)len, NULL, 0);
+      wchar_t* utf16 = (wchar_t*)mrb_malloc(mrb, (wlen+1) * sizeof(wchar_t));
+      if (MultiByteToWideChar(CP_UTF8, 0, p, (int)len, utf16, wlen) > 0) {
+        utf16[wlen] = 0;
+        WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE),
+                      utf16, (DWORD)wlen, &written, NULL);
+      }
+      mrb_free(mrb, utf16);
+    }
+    else
+#endif
+    {
+      fwrite(p, (size_t)len, 1, stdout);
+    }
+    fflush(stdout);
   }
   return mrb_nil_value();
 }
@@ -49,9 +49,7 @@ mrb_printstr(mrb_state *mrb, mrb_value self)
 void
 mrb_mruby_print_gem_init(mrb_state* mrb)
 {
-  struct RClass *krn;
-  krn = mrb->kernel_module;
-  mrb_define_method(mrb, krn, "__printstr__", mrb_printstr, MRB_ARGS_REQ(1));
+  mrb_define_method(mrb, mrb->kernel_module, "__printstr__", mrb_printstr, MRB_ARGS_REQ(1));
 }
 
 void