diff --git a/src/map/wmts.cpp b/src/map/wmts.cpp
index d65f03d9..089f8de4 100644
--- a/src/map/wmts.cpp
+++ b/src/map/wmts.cpp
@@ -243,6 +243,8 @@ bool WMTS::getCapabilities(const QString &url, const QString &file)
 bool WMTS::load(const QString &file, const QString &url, const QString &layer,
   const QString &set)
 {
+	QMap<QString, Zoom>::const_iterator it;
+
 	if (!QFileInfo(file).exists())
 		if (!getCapabilities(url, file))
 			return false;
@@ -257,6 +259,12 @@ bool WMTS::load(const QString &file, const QString &url, const QString &layer,
 		_errorString = "No tile matrix found";
 		return false;
 	}
+	for (it = _zooms.constBegin(); it != _zooms.constEnd(); ++it) {
+		if (!it->isValid()) {
+			_errorString = it->id + ": invalid tile matrix definition";
+			return false;
+		}
+	}
 
 	return true;
 }
diff --git a/src/map/wmts.h b/src/map/wmts.h
index 98e4030c..4bab87eb 100644
--- a/src/map/wmts.h
+++ b/src/map/wmts.h
@@ -20,8 +20,12 @@ public:
 		QSize matrix;
 		QRect limits;
 
+		Zoom() : scaleDenominator(0) {}
 		bool operator<(const Zoom &other) const
 			{return this->scaleDenominator > other.scaleDenominator;}
+		bool isValid() const
+			{return scaleDenominator > 0 && !id.isEmpty() && tile.isValid()
+			  && matrix.isValid();}
 	};
 
 	bool load(const QString &path, const QString &url, const QString &layer,