diff --git a/assembler.js b/assembler.js
index 05d7d0d..de50abe 100644
--- a/assembler.js
+++ b/assembler.js
@@ -77,7 +77,7 @@ function decodeInstructions(line) {
       continue;
     }
 
-    let op_arg_array = line.split(" "); // split line into an array of [op, arg]
+    let op_arg_array = line.split(/\s+/); // split line into an array of [op, arg]
     let opName = op_arg_array[0].toLowerCase();
     let arg_str = op_arg_array[1];
     let arg_num = null;