diff --git a/libs/pbd3/convert.cc b/libs/pbd3/convert.cc
index 0b3d3e1db9..60d39c91e2 100644
--- a/libs/pbd3/convert.cc
+++ b/libs/pbd3/convert.cc
@@ -96,13 +96,13 @@ short_version (string orig, string::size_type target_length)
 int
 atoi (const string& s)
 {
-	return atoi (s.c_str());
+	return std::atoi (s.c_str());
 }
 
 double
 atof (const string& s)
 {
-	return atof (s.c_str());
+	return std::atof (s.c_str());
 }
 
 vector<string>