diff --git a/6502asm.JSON-tmLanguage b/6502asm.JSON-tmLanguage
index c7d3495..133a7cb 100644
--- a/6502asm.JSON-tmLanguage
+++ b/6502asm.JSON-tmLanguage
@@ -59,7 +59,7 @@
         },
 
         {
-            "match": "(?i)\\%[0|1]+)\\b",
+            "match": "(?i)\\%([0|1]+)\\b",
             "name": "constant.numeric.asm",
             "comment": "Binary number constant"
         },
diff --git a/6502asm.tmLanguage b/6502asm.tmLanguage
index 30beaaf..2f889ce 100644
--- a/6502asm.tmLanguage
+++ b/6502asm.tmLanguage
@@ -86,7 +86,7 @@
 			<key>comment</key>
 			<string>Binary number constant</string>
 			<key>match</key>
-			<string>(?i)\%[0|1]+)\b</string>
+			<string>(?i)\%([0|1]+)\b</string>
 			<key>name</key>
 			<string>constant.numeric.asm</string>
 		</dict>