diff --git a/src/blackmisc/tuple.cpp b/src/blackmisc/tuple.cpp
index 4760379d6..7ae495877 100644
--- a/src/blackmisc/tuple.cpp
+++ b/src/blackmisc/tuple.cpp
@@ -17,7 +17,7 @@ namespace BlackMisc
         for (const auto c : string)
         {
             if (c == '(') { level++; }
-            if (c == ')') { level++; }
+            if (c == ')') { level--; }
             if (c == ',' && level == 0) { m_raw.push_back(current.trimmed()); current.clear(); }
             else { current += c; }
         }