diff --git a/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go b/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go
index 0ba1197fd..b2350457b 100644
--- a/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go
+++ b/modules/caddyhttp/reverseproxy/fastcgi/caddyfile.go
@@ -310,25 +310,24 @@ func parsePHPFastCGI(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error
 
 	// if the index is turned off, we skip the redirect and try_files
 	if indexFile != "off" {
-		var disableDirRedir bool
+		dirRedir := false
+		dirIndex := "{http.request.uri.path}/" + indexFile
 
 		// if tryFiles wasn't overridden, use a reasonable default
 		if len(tryFiles) == 0 {
-			tryFiles = []string{"{http.request.uri.path}", "{http.request.uri.path}/" + indexFile, indexFile}
+			tryFiles = []string{"{http.request.uri.path}", dirIndex, indexFile}
+			dirRedir = true
 		} else {
-			indexPattern := "{http.request.uri.path}/" + indexFile
-			disableDirRedir = true
-
 			for _, tf := range tryFiles {
-				if tf == indexPattern {
-					disableDirRedir = false
+				if tf == dirIndex {
+					dirRedir = true
 
 					break
 				}
 			}
 		}
 
-		if !disableDirRedir {
+		if dirRedir {
 			// route to redirect to canonical path if index PHP file
 			redirMatcherSet := caddy.ModuleMap{
 				"file": h.JSON(fileserver.MatchFile{