diff --git a/src/js/simplemde.js b/src/js/simplemde.js
index 9b50513..c61fd6f 100644
--- a/src/js/simplemde.js
+++ b/src/js/simplemde.js
@@ -1387,7 +1387,7 @@ function SimpleMDE(options) {
 
 
 	// Merging the promptTexts, with the given options
-	options.promptTexts = promptTexts;
+	options.promptTexts = extend({}, promptTexts, options.promptTexts || {});
 
 
 	// Merging the blockStyles, with the given options
@@ -2079,4 +2079,4 @@ SimpleMDE.prototype.toTextArea = function() {
 	}
 };
 
-module.exports = SimpleMDE;
\ No newline at end of file
+module.exports = SimpleMDE;