diff --git a/rpc/middleware/middleware_test.go b/rpc/middleware/middleware_test.go
index a02b42c5b..daadcffa7 100644
--- a/rpc/middleware/middleware_test.go
+++ b/rpc/middleware/middleware_test.go
@@ -76,12 +76,12 @@ func TestStatusMiddleware(t *testing.T) {
 		{
 			healthy:         nil,
 			expectedStatus:  http.StatusOK,
-			expectedMessage: "{\"jsonrpc\":\"2.0\",\"result\":{\"isHealthy\":true,:\"error\":\"\"},\"id\":-1}",
+			expectedMessage: "{\"jsonrpc\":\"2.0\",\"result\":{\"isHealthy\":true,\"error\":\"\"},\"id\":-1}",
 		},
 		{
 			healthy:         errors.New("node unhealthy"),
 			expectedStatus:  http.StatusOK,
-			expectedMessage: "{\"jsonrpc\":\"2.0\",\"result\":{\"isHealthy\":false,:\"error\":\"node unhealthy\"},\"id\":-1}",
+			expectedMessage: "{\"jsonrpc\":\"2.0\",\"result\":{\"isHealthy\":false,\"error\":\"node unhealthy\"},\"id\":-1}",
 		},
 	}
 
diff --git a/rpc/middleware/status.go b/rpc/middleware/status.go
index 3b16af062..01e16e559 100644
--- a/rpc/middleware/status.go
+++ b/rpc/middleware/status.go
@@ -24,7 +24,7 @@ func (s Status) Handler(logger log.Logger) HandlerFunc {
 				if err != nil {
 					errS = err.Error()
 				}
-				json := `{"jsonrpc":"2.0","result":{"isHealthy":` + strconv.FormatBool(isHealthy) + `,:"error":"` + errS + `"},"id":-1}`
+				json := `{"jsonrpc":"2.0","result":{"isHealthy":` + strconv.FormatBool(isHealthy) + `,"error":"` + errS + `"},"id":-1}`
 				_, err = w.Write([]byte(json))
 				if err != nil {
 					return