diff --git a/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java b/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java
index 4358c2f..66f16bc 100644
--- a/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java
+++ b/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java
@@ -106,7 +106,10 @@ public class OpenSSLCertificateCreator {
 
             Path fullchain = tmpDir.resolve("fullchain.pem");
             try {
-                Files.write(fullchain, Files.readAllBytes(certAuthority.certificatePath()), StandardOpenOption.CREATE);
+                Path certAuthFullchain = Optional
+                    .ofNullable(certAuthority.fullchainPath())
+                    .orElse(certAuthority.certificatePath());
+                Files.write(fullchain, Files.readAllBytes(certAuthFullchain), StandardOpenOption.CREATE);
                 Files.write(fullchain, Files.readAllBytes(signedCert), StandardOpenOption.APPEND);
             } catch (IOException e) {
                 throw new CommandLineOperationException("Failed to create fullchain file.", e);