diff --git a/binding-mri/binding-mri.cpp b/binding-mri/binding-mri.cpp
index d70e939..802ac45 100644
--- a/binding-mri/binding-mri.cpp
+++ b/binding-mri/binding-mri.cpp
@@ -114,8 +114,6 @@ static void printP(int argc, VALUE *argv,
 	}
 
 	showMsg(RSTRING_PTR(dispString));
-
-	rb_str_free(dispString);
 }
 
 RB_METHOD(mriPrint)