1 files changed, 8 insertions, 0 deletions
diff --git a/src/crypto/hmac.rs b/src/crypto/hmac.rs
index a7a854b7..8096a948 100644
--- a/src/crypto/hmac.rs
+++ b/src/crypto/hmac.rs
@@ -61,6 +61,14 @@ impl HMAC {
     }
 }
 
+impl Drop for HMAC {
+    fn drop(&mut self) {
+        unsafe {
+            ffi::HMAC_CTX_cleanup(&mut self.ctx);
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use serialize::hex::FromHex;