diff --git a/config.go b/config.go
index 76f49f4..378b0d1 100644
--- a/config.go
+++ b/config.go
@@ -744,6 +744,14 @@ func NewInclude(directives []string, hasEquals bool, pos Position, comment strin
 	matches = removeDups(matches)
 	inc.matches = matches
 	for i := range matches {
+		// Skip directories - only process regular files
+		info, err := os.Stat(matches[i])
+		if err != nil {
+			return nil, err
+		}
+		if info.IsDir() {
+			continue
+		}
 		config, err := parseWithDepth(matches[i], depth)
 		if err != nil {
 			return nil, err