diff --git a/version.h.in b/version.h.in
index 447e933..e3c01db 100644
--- a/version.h.in
+++ b/version.h.in
@@ -44,12 +44,6 @@ extern "C" {
 
 #define NETTLE_USE_MINI_GMP @NETTLE_USE_MINI_GMP@
 
-/* We need a preprocessor constant for GMP_NUMB_BITS, simply using
-   sizeof(mp_limb_t) * CHAR_BIT is not good enough. */
-#if NETTLE_USE_MINI_GMP
-# define GMP_NUMB_BITS @GMP_NUMB_BITS@
-#endif
-
 #ifdef __cplusplus
 }
 #endif