Index: ext/libicpf/src/mutex.h
===================================================================
diff -u -N -r30ed05249d32bbb24596169c77afa3c878299cb3 -r338a33bbdb8c82416f0351408eea3243520784e5
--- ext/libicpf/src/mutex.h	(.../mutex.h)	(revision 30ed05249d32bbb24596169c77afa3c878299cb3)
+++ ext/libicpf/src/mutex.h	(.../mutex.h)	(revision 338a33bbdb8c82416f0351408eea3243520784e5)
@@ -51,7 +51,7 @@
 	mutex();							///< Standard constructor
 	// the constructor below will not be excluded without ENABLE_MUTEX_DEBUGGING, sice it would require
 	// too much changes throughout the code that once was designed for debugging.
-	mutex(const char_t* /*pszStr*/);	///< Helper constructor, used as a compatibility layer with d_mutex
+	explicit mutex(const char_t* /*pszStr*/);	///< Helper constructor, used as a compatibility layer with d_mutex
 
 	virtual ~mutex();					///< Standard destructor
 /**@}*/