diff --git a/include/linuxdeploy/core/appdir.h b/include/linuxdeploy/core/appdir.h
index 35910e4..b9eb3e5 100644
--- a/include/linuxdeploy/core/appdir.h
+++ b/include/linuxdeploy/core/appdir.h
@@ -96,7 +96,7 @@ namespace linuxdeploy {
                     bool deployDependenciesForExistingFiles();
 
                     // disable deployment of copyright files for this instance
-                    bool setDisableCopyrightFilesDeployment(bool disable);
+                    void setDisableCopyrightFilesDeployment(bool disable);
             };
         }
     }
diff --git a/src/core/appdir.cpp b/src/core/appdir.cpp
index 37d24d9..408207b 100644
--- a/src/core/appdir.cpp
+++ b/src/core/appdir.cpp
@@ -843,7 +843,7 @@ namespace linuxdeploy {
                 return true;
             }
 
-            bool AppDir::setDisableCopyrightFilesDeployment(bool disable) {
+            void AppDir::setDisableCopyrightFilesDeployment(bool disable) {
                 d->disableCopyrightFilesDeployment = disable;
             }
         }