diff --git a/.ci/asciidoc-converter/src/main/kotlin/org/sdpi/asciidoc/extension/NumberingProcessor.kt b/.ci/asciidoc-converter/src/main/kotlin/org/sdpi/asciidoc/extension/NumberingProcessor.kt
index 593c505..99b6825 100644
--- a/.ci/asciidoc-converter/src/main/kotlin/org/sdpi/asciidoc/extension/NumberingProcessor.kt
+++ b/.ci/asciidoc-converter/src/main/kotlin/org/sdpi/asciidoc/extension/NumberingProcessor.kt
@@ -117,7 +117,7 @@ class NumberingProcessor(
                             node.wrapped.id, if (isInAppendix()) {
                                 if (node.wrapped.isAppendix()) {
                                     LabelInfo(
-                                        (currentAppendix - 1).toString(),
+                                        currentAppendix.toString(),
                                         LabelSource.APPENDIX,
                                         currentVolumeCaption,
                                         refText
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef8fcc9..b71088a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,6 +40,8 @@ Each section shall contain a list of action items of the following format: `<bri
 
 ### Editorial Fixes
 
+- Wrong appendix numbering in references ([#189](https://github.com/IHE/DEV.SDPi/issues/189))).
+
 ## [1.0.1] - 2023-04-14
 
 ### Editorial Fixes