diff --git a/src/headers/tomcrypt_custom.h b/src/headers/tomcrypt_custom.h
index 155b663..ce72015 100644
--- a/src/headers/tomcrypt_custom.h
+++ b/src/headers/tomcrypt_custom.h
@@ -549,9 +549,9 @@
 #define LTC_MUTEX_GLOBAL(x)   pthread_mutex_t x = PTHREAD_MUTEX_INITIALIZER;
 #define LTC_MUTEX_PROTO(x)    extern pthread_mutex_t x;
 #define LTC_MUTEX_TYPE(x)     pthread_mutex_t x;
-#define LTC_MUTEX_INIT(x)     pthread_mutex_init(x, NULL);
-#define LTC_MUTEX_LOCK(x)     pthread_mutex_lock(x);
-#define LTC_MUTEX_UNLOCK(x)   pthread_mutex_unlock(x);
+#define LTC_MUTEX_INIT(x)     LTC_ARGCHK(pthread_mutex_init(x, NULL) == 0);
+#define LTC_MUTEX_LOCK(x)     LTC_ARGCHK(pthread_mutex_lock(x) == 0);
+#define LTC_MUTEX_UNLOCK(x)   LTC_ARGCHK(pthread_mutex_unlock(x) == 0);
 
 #else