diff --git a/.wolfssl_known_macro_extras b/.wolfssl_known_macro_extras
index 7947ebef3..eeedf9ff1 100644
--- a/.wolfssl_known_macro_extras
+++ b/.wolfssl_known_macro_extras
@@ -518,7 +518,6 @@ USE_STSAFE_VERBOSE
 USE_TLSV13
 USE_WOLF_STRNSTR
 USS_API
-WindowsCE
 WC_AESXTS_STREAM_NO_REQUEST_ACCOUNTING
 WC_AES_BS_WORD_SIZE
 WC_AES_GCM_DEC_AUTH_EARLY
@@ -858,6 +857,7 @@ WOLF_CRYPTO_CB_ONLY_ECC
 WOLF_CRYPTO_CB_ONLY_RSA
 WOLF_CRYPTO_DEV
 WOLF_NO_TRAILING_ENUM_COMMAS
+WindowsCE
 XGETPASSWD
 XMSS_CALL_PRF_KEYGEN
 XPAR_VERSAL_CIPS_0_PSPMC_0_PSV_CORTEXA72_0_TIMESTAMP_CLK_FREQ
diff --git a/linuxkm/lkcapi_glue.c b/linuxkm/lkcapi_glue.c
index 0bc3a539a..19ba13ed6 100644
--- a/linuxkm/lkcapi_glue.c
+++ b/linuxkm/lkcapi_glue.c
@@ -4258,6 +4258,13 @@ static int linuxkm_test_aesecb(void) {
     #endif
 #endif /* LINUXKM_LKCAPI_REGISTER_ECDSA */
 
+#ifdef LINUXKM_LKCAPI_REGISTER_ECDH
+    #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 13, 0)
+        /* currently incompatible with kernel 5.12 or earlier. */
+        #undef LINUXKM_LKCAPI_REGISTER_ECDH
+    #endif
+#endif
+
 #if defined (LINUXKM_LKCAPI_REGISTER_ECDSA)
     #include "linuxkm/lkcapi_ecdsa_glue.c"
 #endif /* LINUXKM_LKCAPI_REGISTER_ECDSA */