diff --git a/src/secp256k1.c b/src/secp256k1.c
index 15981f46e21af..73adc6e020de6 100644
--- a/src/secp256k1.c
+++ b/src/secp256k1.c
@@ -457,6 +457,7 @@ int secp256k1_ec_privkey_negate(const secp256k1_context* ctx, unsigned char *sec
     secp256k1_scalar_negate(&sec, &sec);
     secp256k1_scalar_get_b32(seckey, &sec);
 
+    secp256k1_scalar_clear(&sec);
     return 1;
 }