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-rw-r--r--src/libstate/libstate.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstate/libstate.h b/src/libstate/libstate.h
index 2493863a9..a0421953e 100644
--- a/src/libstate/libstate.h
+++ b/src/libstate/libstate.h
@@ -77,7 +77,7 @@ class BOTAN_DLL Library_State
* @param key the key of the option to set
* @param value the value to set
*/
- void set_option(const std::string key, const std::string& value);
+ void set_option(const std::string& key, const std::string& value);
/**
* Add a parameter value to the "alias" section.