diff --git a/crates/stdlib/src/binascii.rs b/crates/stdlib/src/binascii.rs
index 579a5081c..0cf005628 100644
--- a/crates/stdlib/src/binascii.rs
+++ b/crates/stdlib/src/binascii.rs
@@ -504,7 +504,7 @@ mod decl {
                 }
                 in_idx += 1;
             }
-            if buflen > 0 && in_idx < buflen && buf[in_idx - 1] == b'\r' {
+            if in_idx > 0 && in_idx < buflen && buf[in_idx - 1] == b'\r' {
                 crlf = true;
             }