diff --git a/library/lmots.c b/library/lmots.c
index e196635..9a6c6be 100644
--- a/library/lmots.c
+++ b/library/lmots.c
@@ -32,7 +32,7 @@
 
 #include "common.h"
 
-#ifdef MBEDTLS_LMS_C
+#if defined(MBEDTLS_LMS_C)
 
 #include <string.h>
 
@@ -568,7 +568,7 @@
     return( 0 );
 }
 
-#ifdef MBEDTLS_LMS_PRIVATE
+#if defined(MBEDTLS_LMS_PRIVATE)
 
 void mbedtls_lmots_init_private( mbedtls_lmots_private_t *ctx )
 {
@@ -851,5 +851,5 @@
     return( 0 );
 }
 
-#endif /* MBEDTLS_LMS_PRIVATE */
-#endif /* MBEDTLS_LMS_C */
+#endif /* defined(MBEDTLS_LMS_PRIVATE) */
+#endif /* defined(MBEDTLS_LMS_C) */