diff --git a/library/ecdsa.c b/library/ecdsa.c
index ef2519b..355bd90 100644
--- a/library/ecdsa.c
+++ b/library/ecdsa.c
@@ -218,8 +218,8 @@
 #endif /* MBEDTLS_ECP_RESTARTABLE */
 
 #if defined(MBEDTLS_ECDSA_DETERMINISTIC) || \
-    ! defined(MBEDTLS_ECDSA_SIGN_ALT) || \
-    ! defined(MBEDTLS_ECDSA_VERIFY_ALT)
+    !defined(MBEDTLS_ECDSA_SIGN_ALT)     || \
+    !defined(MBEDTLS_ECDSA_VERIFY_ALT)
 /*
  * Derive a suitable integer for group grp from a buffer of length len
  * SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3