diff --git a/src/gzip.rs b/src/gzip.rs
index 2799275..8bc3a39 100644
--- a/src/gzip.rs
+++ b/src/gzip.rs
@@ -442,7 +442,7 @@ where
         let mut cbuf = [0; 1];
         reader.read_exact(&mut cbuf)?;
         if cbuf[0] == 0 {
-            return Ok(unsafe { CString::from_vec_unchecked(buf) });
+            return Ok(CString::new(buf).unwrap());
         }
         buf.push(cbuf[0]);
     }
diff --git a/src/lib.rs b/src/lib.rs
index 2e0cc31..4b8a3ce 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 //! A Rust implementation of DEFLATE algorithm and related formats (ZLIB, GZIP).
+#![forbid(unsafe_code)]
 #![warn(missing_docs)]
 pub use finish::Finish;