diff --git a/binding-mri/binding-util.cpp b/binding-mri/binding-util.cpp
index d2d924a..1a850e7 100644
--- a/binding-mri/binding-util.cpp
+++ b/binding-mri/binding-util.cpp
@@ -94,7 +94,7 @@ void raiseRbExc(const Exception &exc)
 	RbData *data = getRbData();
 	VALUE excClass = data->exc[excToRbExc[exc.type]];
 
-	rb_raise(excClass, exc.msg.c_str());
+	rb_raise(excClass, "%s", exc.msg.c_str());
 }
 
 int