diff --git a/src/common/proxy_wasm/ngx_proxy_wasm_host.c b/src/common/proxy_wasm/ngx_proxy_wasm_host.c
index e4d8eda8b..7fdc7946d 100644
--- a/src/common/proxy_wasm/ngx_proxy_wasm_host.c
+++ b/src/common/proxy_wasm/ngx_proxy_wasm_host.c
@@ -1601,22 +1601,22 @@ ngx_proxy_wasm_hfuncs_define_metric(ngx_wavm_instance_t *instance,
     max_len = metrics->config.max_metric_name_length;
 
     switch(pw_type) {
-        case NGX_PROXY_WASM_METRIC_COUNTER:
-            type = NGX_WA_METRIC_COUNTER;
-            break;
+    case NGX_PROXY_WASM_METRIC_COUNTER:
+        type = NGX_WA_METRIC_COUNTER;
+        break;
 
-        case NGX_PROXY_WASM_METRIC_GAUGE:
-            type = NGX_WA_METRIC_GAUGE;
-            break;
+    case NGX_PROXY_WASM_METRIC_GAUGE:
+        type = NGX_WA_METRIC_GAUGE;
+        break;
 
-        case NGX_PROXY_WASM_METRIC_HISTOGRAM:
-            type = NGX_WA_METRIC_HISTOGRAM;
-            break;
+    case NGX_PROXY_WASM_METRIC_HISTOGRAM:
+        type = NGX_WA_METRIC_HISTOGRAM;
+        break;
 
-        default:
-            return ngx_proxy_wasm_result_trap(pwexec, "unknown metric type",
-                                              rets,
-                                              NGX_WAVM_ERROR);
+    default:
+        return ngx_proxy_wasm_result_trap(pwexec, "unknown metric type",
+                                          rets,
+                                          NGX_WAVM_ERROR);
     }
 
     filter_name = pwexec->filter->name;