diff --git a/internal/llm/tools/grep.go b/internal/llm/tools/grep.go
index 61d4fb79a614da282fb48cb23b8e0405f28d23ac..3064ee633cf0e54bfb9d14efdd475cda15a38c85 100644
--- a/internal/llm/tools/grep.go
+++ b/internal/llm/tools/grep.go
@@ -434,7 +434,7 @@ func isBinaryFile(filePath string) bool {
 	}
 
 	// Check for null bytes (common in binary files)
-	for i := 0; i < n; i++ {
+	for i := range n {
 		if buffer[i] == 0 {
 			return true
 		}