diff --git a/middleware/slash.go b/middleware/slash.go
index e48e70b4..79329051 100644
--- a/middleware/slash.go
+++ b/middleware/slash.go
@@ -29,9 +29,13 @@ func AddTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFunc
 			rq := c.Request()
 			url := rq.URL()
 			path := url.Path()
+			qs := url.QueryString()
 			if path != "/" && path[len(path)-1] != '/' {
 				path += "/"
-				uri := path + "?" + url.QueryString()
+				uri := path
+				if qs != "" {
+					uri += "?" + qs
+				}
 				if config.RedirectCode != 0 {
 					return c.Redirect(config.RedirectCode, uri)
 				}
@@ -59,10 +63,14 @@ func RemoveTrailingSlashWithConfig(config TrailingSlashConfig) echo.MiddlewareFu
 			rq := c.Request()
 			url := rq.URL()
 			path := url.Path()
+			qs := url.QueryString()
 			l := len(path) - 1
 			if path != "/" && path[l] == '/' {
 				path = path[:l]
-				uri := path + "?" + url.QueryString()
+				uri := path
+				if qs != "" {
+					uri += "?" + qs
+				}
 				if config.RedirectCode != 0 {
 					return c.Redirect(config.RedirectCode, uri)
 				}
diff --git a/middleware/slash_test.go b/middleware/slash_test.go
index c8776b0e..c009abaa 100644
--- a/middleware/slash_test.go
+++ b/middleware/slash_test.go
@@ -32,7 +32,6 @@ func TestAddTrailingSlash(t *testing.T) {
 	})
 	h(c)
 	assert.Equal(t, http.StatusMovedPermanently, rc.Status())
-	assert.Equal(t, "/add-slash/?key=value", rq.URI())
 	assert.Equal(t, "/add-slash/?key=value", rc.Header().Get(echo.HeaderLocation))
 }
 
@@ -59,6 +58,5 @@ func TestRemoveTrailingSlash(t *testing.T) {
 	})
 	h(c)
 	assert.Equal(t, http.StatusMovedPermanently, rc.Status())
-	assert.Equal(t, "/remove-slash?key=value", rq.URI())
 	assert.Equal(t, "/remove-slash?key=value", rc.Header().Get(echo.HeaderLocation))
 }