diff --git a/mrbgems/mruby-proc-ext/src/proc.c b/mrbgems/mruby-proc-ext/src/proc.c
index 1d2027332..4e90371c5 100644
--- a/mrbgems/mruby-proc-ext/src/proc.c
+++ b/mrbgems/mruby-proc-ext/src/proc.c
@@ -49,7 +49,7 @@ mrb_proc_inspect(mrb_state *mrb, mrb_value self)
     const mrb_irep *irep = p->body.irep;
     const char *filename;
     int32_t line;
-    mrb_str_cat_lit(mrb, str, "@");
+    mrb_str_cat_lit(mrb, str, " ");
 
     filename = mrb_debug_get_filename(mrb, irep, 0);
     mrb_str_cat_cstr(mrb, str, filename ? filename : "-");
diff --git a/mrbgems/mruby-proc-ext/test/proc.rb b/mrbgems/mruby-proc-ext/test/proc.rb
index 322d31c05..7ac508406 100644
--- a/mrbgems/mruby-proc-ext/test/proc.rb
+++ b/mrbgems/mruby-proc-ext/test/proc.rb
@@ -30,7 +30,7 @@ assert('Proc#inspect') do
   else
     file = line = "-"
   end
-  assert_match "#<Proc:0x*@#{file}:#{line}>", ins
+  assert_match "#<Proc:0x* #{file}:#{line}>", ins
 end
 
 assert('Proc#parameters') do