diff --git a/src/portmanager.cpp b/src/portmanager.cpp
index 4ab63c1..d58ae13 100644
--- a/src/portmanager.cpp
+++ b/src/portmanager.cpp
@@ -110,8 +110,8 @@ void PortManager::Add(jack_port_t *port)
 		}
 	}
 
-	size_t pos1 = jack_name.find(':');
-	size_t pos2 = jack_name.find('.', pos1);
+	size_t pos1 = jack_name.find_first_of(':');
+	size_t pos2 = jack_name.find_last_of('.');
 
 	// All ports must have a client part
 	if (pos1 == std::string::npos) return;