diff --git a/wolfssl/wolfcrypt/settings.h b/wolfssl/wolfcrypt/settings.h
index 243df6f7c..0724489e0 100644
--- a/wolfssl/wolfcrypt/settings.h
+++ b/wolfssl/wolfcrypt/settings.h
@@ -2591,6 +2591,10 @@ extern void uITRON4_free(void *p) ;
 #define HAVE_PQC
 #endif
 
+#if defined(HAVE_PQC) && !defined(HAVE_LIBOQS)
+#error "You must have a post-quantum cryptography implementation to use PQC."
+#endif
+
 /* ---------------------------------------------------------------------------
  * Depricated Algorithm Handling
  *   Unless allowed via a build macro, disable support