diff --git a/crypto/evp/pkey_kdf.c b/crypto/evp/pkey_kdf.c
index ddb682c1ed..f983ad2ff3 100644
--- a/crypto/evp/pkey_kdf.c
+++ b/crypto/evp/pkey_kdf.c
@@ -12,6 +12,7 @@
 #include <openssl/evp.h>
 #include <openssl/err.h>
 #include <openssl/kdf.h>
+#include "internal/numbers.h"
 #include "internal/evp_int.h"
 
 static int pkey_kdf_init(EVP_PKEY_CTX *ctx)
diff --git a/crypto/kdf/hkdf.c b/crypto/kdf/hkdf.c
index 5540da35fe..bfccf16750 100644
--- a/crypto/kdf/hkdf.c
+++ b/crypto/kdf/hkdf.c
@@ -14,6 +14,7 @@
 #include <openssl/evp.h>
 #include <openssl/kdf.h>
 #include "internal/cryptlib.h"
+#include "internal/numbers.h"
 #include "internal/evp_int.h"
 #include "kdf_local.h"
 
diff --git a/crypto/kdf/sshkdf.c b/crypto/kdf/sshkdf.c
index 24f37cbed4..300e1adbb2 100644
--- a/crypto/kdf/sshkdf.c
+++ b/crypto/kdf/sshkdf.c
@@ -13,6 +13,7 @@
 #include <openssl/evp.h>
 #include <openssl/kdf.h>
 #include "internal/cryptlib.h"
+#include "internal/numbers.h"
 #include "internal/evp_int.h"
 #include "kdf_local.h"