diff --git a/ccm-core/src/main/java/org/libreccm/theming/StaticThemeProvider.java b/ccm-core/src/main/java/org/libreccm/theming/StaticThemeProvider.java
index 5ebc343b6..46f68f4b6 100644
--- a/ccm-core/src/main/java/org/libreccm/theming/StaticThemeProvider.java
+++ b/ccm-core/src/main/java/org/libreccm/theming/StaticThemeProvider.java
@@ -123,7 +123,7 @@ public class StaticThemeProvider implements ThemeProvider {
             .stream()
             .filter(themePackage -> {
                 return themePackage
-                    .matches(THEMES_PACKAGE + "/([\\w\\d\\s\\.])*/theme.json");
+                    .matches(THEMES_PACKAGE + "/([\\w\\d\\s\\.\\-_])*/theme.json");
             })
             //            .map(themePackage -> {
             //                return themePackage