diff --git a/.github/workflows/os-check.yml b/.github/workflows/os-check.yml
index 94d38f3cf..81f071ccf 100644
--- a/.github/workflows/os-check.yml
+++ b/.github/workflows/os-check.yml
@@ -60,6 +60,7 @@ jobs:
           '--disable-sys-ca-certs',
           '--enable-all CPPFLAGS=-DWOLFSSL_DEBUG_CERTS ',
           '--enable-all CFLAGS="-DWOLFSSL_CHECK_MEM_ZERO"',
+          '--enable-coding=no',
         ]
     name: make check
     if: github.repository_owner == 'wolfssl'
diff --git a/src/ssl_certman.c b/src/ssl_certman.c
index 16f93cecc..8bd3a2f68 100644
--- a/src/ssl_certman.c
+++ b/src/ssl_certman.c
@@ -600,6 +600,9 @@ int wolfSSL_CertManagerLoadCABufferType(WOLFSSL_CERT_MANAGER* cm,
             ret = WOLFSSL_FATAL_ERROR;
         } else {
             if (format == WOLFSSL_FILETYPE_PEM) {
+            #ifndef WOLFSSL_PEM_TO_DER
+                ret = NOT_COMPILED_IN;
+            #else
                 ret = PemToDer(buff, sz, CERT_TYPE, &der, cm->heap, NULL, NULL);
                 if (!ret) {
                     /* Replace buffer pointer and size with DER buffer. */
@@ -610,6 +613,7 @@ int wolfSSL_CertManagerLoadCABufferType(WOLFSSL_CERT_MANAGER* cm,
                     WOLFSSL_ERROR(ret);
                     ret = WOLFSSL_FATAL_ERROR;
                 }
+            #endif
             }
 
             if (ret == WOLFSSL_SUCCESS) {