diff --git a/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java b/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java
index 8300293..060e73c 100644
--- a/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java
+++ b/src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java
@@ -140,8 +140,8 @@ public class OpenSSLCertificateCreator {
                     .ofNullable(certAuthority.fullchainPath())
                     .orElse(certAuthority.certificatePath());
                 // Leaf certificate first, then the CA chain
-                Files.write(fullchain, Files.readAllBytes(signedCert), StandardOpenOption.APPEND);
-                Files.write(fullchain, Files.readAllBytes(certAuthFullchain), StandardOpenOption.CREATE);
+                Files.write(fullchain, Files.readAllBytes(signedCert), StandardOpenOption.CREATE);
+                Files.write(fullchain, Files.readAllBytes(certAuthFullchain), StandardOpenOption.APPEND);
             } catch (IOException e) {
                 throw new CommandLineOperationException("Failed to create fullchain file.", e);
             }