diff --git a/R/app.R b/R/app.R
index f84e02bad3..3b6109554c 100644
--- a/R/app.R
+++ b/R/app.R
@@ -121,8 +121,10 @@ shinyAppDir <- function(appDir, options=list()) {
   appDir <- normalizePath(appDir, mustWork = TRUE)
 
   if (file.exists.ci(appDir, "server.R")) {
+    .globals$appFile <- "server.R"
     shinyAppDir_serverR(appDir, options = options)
   } else if (file.exists.ci(appDir, "app.R")) {
+    .globals$appFile <- "app.R"
     shinyAppDir_appR("app.R", appDir, options = options)
   } else {
     stop("App dir must contain either app.R or server.R.")
diff --git a/R/showcase.R b/R/showcase.R
index c31c43a28a..676e4d7dc9 100644
--- a/R/showcase.R
+++ b/R/showcase.R
@@ -81,7 +81,7 @@ appMetadata <- function(desc) {
 navTabsHelper <- function(files, prefix = "") {
   lapply(files, function(file) {
     with(tags,
-      li(class=if (tolower(file) %in% c("app.r", "server.r", tolower(.globals$appFile))) "active" else "",
+      li(class=if (file %in% .globals$appFile) "active" else "",
          a(href=paste0("#", gsub("\\.|\\s+", "_", file), "_code"),
            "data-toggle"="tab", paste0(prefix, file)))
     )
@@ -106,7 +106,7 @@ tabContentHelper <- function(files, path, language) {
   lapply(files, function(file) {
     with(tags,
       div(class=paste0("tab-pane",
-                      if (tolower(file) %in% c("app.r", "server.r", tolower(.globals$appFile))) " active"
+                      if (file %in% .globals$appFile) " active"
                       else ""),
           id=paste0(gsub("\\.|\\s+", "_", file), "_code"),
           pre(class="shiny-code",