diff --git a/ext/coverage/coverage.c b/ext/coverage/coverage.c
index 05026e1ba2..8503c9d6c6 100644
--- a/ext/coverage/coverage.c
+++ b/ext/coverage/coverage.c
@@ -54,7 +54,7 @@ rb_coverage_start(int argc, VALUE *argv, VALUE klass)
     }
 
     if (mode & COVERAGE_TARGET_METHODS) {
-	me2counter = rb_ident_hash_new();
+        me2counter = rb_ident_hash_new();
     }
     else {
 	me2counter = Qnil;