diff --git a/components/prism-diff.js b/components/prism-diff.js
index 9dfc0e9153..823a41c7ab 100644
--- a/components/prism-diff.js
+++ b/components/prism-diff.js
@@ -39,11 +39,24 @@
 			alias.push("bold");
 		}
 
-		Prism.languages.diff[name] = {
-			// pattern: /^(?:[_].*(?:\r\n?|\n|(?![\s\S])))+/m
-			pattern: RegExp('^(?:[' + prefix + '].*(?:\r\n?|\n|(?![\\s\\S])))+', 'm'),
-			alias: alias
-		};
+		var pattern = RegExp('^(?:[' + prefix + '].*(?:\r\n?|\n|(?![\\s\\S])))+', 'm');
+
+		if (['-', '<', '+', '>'].indexOf(prefix) !== -1) {
+			var inside = {
+				prefix: RegExp('^[' + prefix + ']', 'm')
+			};
+			Prism.languages.diff[name] = {
+				pattern: pattern,
+				alias: alias,
+				inside: inside
+			};
+		} else {
+			Prism.languages.diff[name] = {
+				pattern: pattern,
+				alias: alias
+			};
+		}
+		
 	});
 
 	// make prefixes available to Diff plugin
diff --git a/tests/languages/diff/diff_feature.test b/tests/languages/diff/diff_feature.test
index 4379e56d44..2c9593bf81 100644
--- a/tests/languages/diff/diff_feature.test
+++ b/tests/languages/diff/diff_feature.test
@@ -13,10 +13,10 @@
 [
 	["diff", "!     qt: core\r\n"],
 	["unchanged", "  unchanged\r\n"],
-	["deleted-sign", "-    qt: core\r\n"],
-	["inserted-sign", "+    qt: core gui\r\n"],
-	["deleted-arrow", "< qt: core\r\n"],
-	["inserted-arrow", "> qt: core quick"]
+	["deleted-sign", [["prefix", "-"], "    qt: core\r\n"]],
+	["inserted-sign", [["prefix", "+"], "    qt: core gui\r\n"]],
+	["deleted-arrow", [["prefix", "<"], " qt: core\r\n"]],
+	["inserted-arrow", [["prefix", ">"], " qt: core quick"]]
 ]
 
 ----------------------------------------------------