1 files changed, 1 insertions, 1 deletions
diff --git a/common/str.h b/common/str.h
index 772718a087..c3e773c3e4 100644
--- a/common/str.h
+++ b/common/str.h
@@ -112,7 +112,7 @@ public:
 	String(const String &str);
 	
 	/** Construct a string consisting of the given character. */
-	String(char c);
+	explicit String(char c);
 
 	~String();