diff --git a/src/basic-config.h b/src/basic-config.h
index e4b1b8b056ffb..6f7693cb8fd04 100644
--- a/src/basic-config.h
+++ b/src/basic-config.h
@@ -9,16 +9,8 @@
 
 #ifdef USE_BASIC_CONFIG
 
-#undef USE_ASM_X86_64
-#undef USE_ECMULT_STATIC_PRECOMPUTATION
-#undef USE_EXTERNAL_ASM
-#undef USE_EXTERNAL_DEFAULT_CALLBACKS
-#undef USE_FORCE_WIDEMUL_INT64
-#undef USE_FORCE_WIDEMUL_INT128
-#undef ECMULT_WINDOW_SIZE
-
-#define USE_WIDEMUL_64 1
 #define ECMULT_WINDOW_SIZE 15
+#define ECMULT_GEN_PREC_BITS 4
 
 #endif /* USE_BASIC_CONFIG */
 
diff --git a/src/gen_context.c b/src/gen_context.c
index 05e7dee17531a..024c55726170f 100644
--- a/src/gen_context.c
+++ b/src/gen_context.c
@@ -9,8 +9,9 @@
 #if !defined(ECMULT_GEN_PREC_BITS)
 #include "libsecp256k1-config.h"
 #endif
-#define USE_BASIC_CONFIG 1
-#include "basic-config.h"
+
+/* We can't require the precomputed tables when creating them. */
+#undef USE_ECMULT_STATIC_PRECOMPUTATION
 
 #include "include/secp256k1.h"
 #include "assumptions.h"