diff --git a/syntaxes/reason-markdown-codeblock.json b/syntaxes/reason-markdown-codeblock.json
index 20cd416..c59f526 100644
--- a/syntaxes/reason-markdown-codeblock.json
+++ b/syntaxes/reason-markdown-codeblock.json
@@ -6,7 +6,7 @@
 	],
 	"repository": {
 		"reason-code-block": {
-			"begin": "(re|reason|reasonml)(\\s+[^`~]*)?$",
+			"begin": "(?<=(```|~~~))(re|reason|reasonml)(\\s+[^`~]*)?$",
 			"end": "(^|\\G)(?=\\s*[`~]{3,}\\s*$)",
 			"patterns": [
 				{
@@ -23,4 +23,4 @@
 		}
 	},
 	"scopeName": "markdown.reason.codeblock"
-}
\ No newline at end of file
+}