diff --git a/R/frameApplication.R b/R/frameApplication.R
index 90cd006..e41b4f0 100644
--- a/R/frameApplication.R
+++ b/R/frameApplication.R
@@ -103,9 +103,9 @@ FrameApplication <- R6::R6Class(
       if (private$withBS4) {
         # Attach boostrap 4 css shim
         if (getOption("shiny.minified", TRUE)) {
-          css <- "bootstrap-4-shim.min.css"
+          css <- "css/bootstrap-4-shim.min.css"
         } else {
-          css <- "bootstrap-4-shim.css"
+          css <- "css/bootstrap-4-shim.css"
         }
         uiDeps <- htmltools::htmlDependency(
           "AVSDevR.ShinyApplication",