diff --git a/test/run-spec-test.py b/test/run-spec-test.py
index d944692..f0c6617 100755
--- a/test/run-spec-test.py
+++ b/test/run-spec-test.py
@@ -469,7 +469,7 @@ else:
         "memory_redundancy", "float_memory",
         "memory", "memory_trap", "memory_grow",
 
-		"unreachable",
+        "unreachable",
         "switch", "if", "br", "br_if", "br_table", "loop", "block",
         "return", "nop", "start",