diff --git a/crypto/evp/exchange.c b/crypto/evp/exchange.c
index 1c48e7f0ba..20503b5f67 100644
--- a/crypto/evp/exchange.c
+++ b/crypto/evp/exchange.c
@@ -13,6 +13,7 @@
 #include "internal/refcount.h"
 #include "internal/evp_int.h"
 #include "internal/provider.h"
+#include "internal/numbers.h"   /* includes SIZE_MAX */
 #include "evp_locl.h"
 
 static EVP_KEYEXCH *evp_keyexch_new(OSSL_PROVIDER *prov)