diff --git a/gtk2_ardour/pan_automation_time_axis.cc b/gtk2_ardour/pan_automation_time_axis.cc
index 3169f65059..ec884151b5 100644
--- a/gtk2_ardour/pan_automation_time_axis.cc
+++ b/gtk2_ardour/pan_automation_time_axis.cc
@@ -108,7 +108,7 @@ void
 PanAutomationTimeAxisView::add_line (AutomationLine& line)
 {
 	char buf[32];
-	snprintf(buf,32,"Line %u",lines.size()+1);
+	snprintf(buf,32,"Line %zu",lines.size()+1);
 	multiline_selector.append_text(buf);
 
 	if (lines.empty()) {
diff --git a/libs/ardour/panner.cc b/libs/ardour/panner.cc
index 8336c4697c..f866b5ae10 100644
--- a/libs/ardour/panner.cc
+++ b/libs/ardour/panner.cc
@@ -1258,10 +1258,10 @@ Panner::set_state (const XMLNode& node)
 			float x, y;
 			
 			prop = (*niter)->property (X_("x"));
-			sscanf (prop->value().c_str(), "%.12g", &x);
+			sscanf (prop->value().c_str(), "%g", &x);
 			
 			prop = (*niter)->property (X_("y"));
-			sscanf (prop->value().c_str(), "%.12g", &y);
+			sscanf (prop->value().c_str(), "%g", &y);
 			
 			outputs.push_back (Output (x, y));
 		}
diff --git a/libs/ardour/track.cc b/libs/ardour/track.cc
index 941524b54c..f81ef9de4d 100644
--- a/libs/ardour/track.cc
+++ b/libs/ardour/track.cc
@@ -152,7 +152,7 @@ bool
 Track::can_record()
 {
 	bool will_record = true;
-	for (int i = 0; i < _inputs.size() && will_record; i++) {
+	for (size_t i = 0; i < _inputs.size() && will_record; i++) {
 		if (!_inputs[i]->connected())
 			will_record = false;
 	}