diff --git a/configmgr/source/components.cxx b/configmgr/source/components.cxx
index 0b8e5f608989..b401197f7026 100644
--- a/configmgr/source/components.cxx
+++ b/configmgr/source/components.cxx
@@ -488,7 +488,7 @@ Components::Components(
         for (;; ++c) {
             if (c == conf.getLength() || conf[c] == ' ') {
                 throw css::uno::RuntimeException(
-                    "CONFIGURATION_LAYERS: missing \":\"");
+                    "CONFIGURATION_LAYERS: missing ':' in \"" + conf + "\"");
             }
             if (conf[c] == ':') {
                 break;