diff --git a/build/index.php b/build/index.php
index 0f043ce..65b5a16 100644
--- a/build/index.php
+++ b/build/index.php
@@ -1945,7 +1945,7 @@ register_module([
 class Slimdown {
 	public static $rules = array (
 		'/\r\n/' => "\n",											// new line normalisation
-		'/(#+)(.*)/' => 'self::header',								// headers
+		'/^(#+)(.*)/' => 'self::header',								// headers
 		'/(\*)(.*?)\1/' => '<strong>\2</strong>',					// bold
 		'/(_)(.*?)\1/' => '<em>\2</em>',							// emphasis
 		
diff --git a/module_index.json b/module_index.json
index 87dd225..917fa0e 100644
--- a/module_index.json
+++ b/module_index.json
@@ -149,7 +149,7 @@
         "author": "Johnny Broadway & Starbeamrainbowlabs",
         "description": "The default parser for Pepperminty Wiki. Based on Johnny Broadway's Slimdown (with more than a few modifications). This parser's features are documented in the help page.",
         "id": "parser-default",
-        "lastupdate": 1443945169,
+        "lastupdate": 1443964067,
         "optional": false
     },
     {
diff --git a/modules/parser-default.php b/modules/parser-default.php
index 16e3c31..6f335ea 100644
--- a/modules/parser-default.php
+++ b/modules/parser-default.php
@@ -50,7 +50,7 @@ register_module([
 class Slimdown {
 	public static $rules = array (
 		'/\r\n/' => "\n",											// new line normalisation
-		'/(#+)(.*)/' => 'self::header',								// headers
+		'/^(#+)(.*)/' => 'self::header',								// headers
 		'/(\*)(.*?)\1/' => '<strong>\2</strong>',					// bold
 		'/(_)(.*?)\1/' => '<em>\2</em>',							// emphasis