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-rw-r--r--src/config/ConfigGlobal.hxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/config/ConfigGlobal.hxx b/src/config/ConfigGlobal.hxx
index 9e8687e82..b24b9aada 100644
--- a/src/config/ConfigGlobal.hxx
+++ b/src/config/ConfigGlobal.hxx
@@ -73,7 +73,7 @@ config_find_block(ConfigBlockOption option, const char *key, const char *value);
gcc_pure
const char *
-config_get_string(enum ConfigOption option, const char *default_value);
+config_get_string(enum ConfigOption option, const char *default_value=nullptr);
/**
* Returns an optional configuration variable which contains an