diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index 0d7d4ffc4c2..cb1f0c981a7 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1252,7 +1252,7 @@ export class MarkdownString {
 		// escape markdown syntax tokens: http://daringfireball.net/projects/markdown/syntax#backslash
 		this.value += (this.supportThemeIcons ? escapeCodicons(value) : value)
 			.replace(/[\\`*_{}[\]()#+\-.!]/g, '\\$&')
-			.replace('\n', '\n\n');
+			.replace(/\n/, '\n\n');
 
 		return this;
 	}