diff --git a/src/common/util.cpp b/src/common/util.cpp
index 7947b460..4d4564b6 100644
--- a/src/common/util.cpp
+++ b/src/common/util.cpp
@@ -10,6 +10,7 @@
 #endif // Q_OS_ANDROID
 #include "util.h"
 
+#define SQLITE_DB_MAGIC "SQLite format 3"
 
 #ifdef Q_OS_ANDROID
 static QString documentName(const QString &path)
@@ -156,3 +157,21 @@ const QTemporaryDir &Util::tempDir()
 	static QTemporaryDir dir;
 	return dir;
 }
+
+bool Util::isSQLiteDB(const QString &path, QString &errorString)
+{
+	QFile file(path);
+	char magic[sizeof(SQLITE_DB_MAGIC)];
+
+	if (!file.open(QFile::ReadOnly)) {
+		errorString = file.errorString();
+		return false;
+	}
+	if ((file.read(magic, sizeof(magic)) < (qint64)sizeof(magic))
+	  || memcmp(SQLITE_DB_MAGIC, magic, sizeof(SQLITE_DB_MAGIC))) {
+		errorString = "Not a SQLite database file";
+		return false;
+	}
+
+	return true;
+}
diff --git a/src/common/util.h b/src/common/util.h
index b93faa59..a9863fc4 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -16,6 +16,7 @@ namespace Util
 	QString file2name(const QString &path);
 	QString displayName(const QString &path);
 	const QTemporaryDir &tempDir();
+	bool isSQLiteDB(const QString &path, QString &errorString);
 }
 
 #endif // UTIL_H
diff --git a/src/map/mbtilesmap.cpp b/src/map/mbtilesmap.cpp
index 7af7047c..a9cee8e4 100644
--- a/src/map/mbtilesmap.cpp
+++ b/src/map/mbtilesmap.cpp
@@ -1,6 +1,7 @@
 #include <QSqlQuery>
 #include <QSqlRecord>
 #include <QSqlField>
+#include <QSqlError>
 #include <QPainter>
 #include <QPixmapCache>
 #include <QImageReader>
@@ -48,12 +49,15 @@ MBTilesMap::MBTilesMap(const QString &fileName, QObject *parent)
   : Map(fileName, parent), _mapRatio(1.0), _tileRatio(1.0), _scalable(false),
   _scaledSize(0), _valid(false)
 {
+	if (!Util::isSQLiteDB(fileName, _errorString))
+		return;
+
 	_db = QSqlDatabase::addDatabase("QSQLITE", fileName);
 	_db.setDatabaseName(fileName);
 	_db.setConnectOptions("QSQLITE_OPEN_READONLY");
 
 	if (!_db.open()) {
-		_errorString = "Error opening database file";
+		_errorString = _db.lastError().text();
 		return;
 	}
 
diff --git a/src/map/oruxmap.cpp b/src/map/oruxmap.cpp
index f62a9e83..1ecd2071 100644
--- a/src/map/oruxmap.cpp
+++ b/src/map/oruxmap.cpp
@@ -413,6 +413,12 @@ OruxMap::OruxMap(const QString &fileName, QObject *parent)
 
 	if (dir.exists("OruxMapsImages.db")) {
 		QString dbFile(dir.absoluteFilePath("OruxMapsImages.db"));
+
+		if (!Util::isSQLiteDB(dbFile, _errorString)) {
+			_errorString = "OruxMapsImages.db: " + _errorString;
+			return;
+		}
+
 		_db = QSqlDatabase::addDatabase("QSQLITE", dbFile);
 		_db.setDatabaseName(dbFile);
 		_db.setConnectOptions("QSQLITE_OPEN_READONLY");
diff --git a/src/map/osmdroidmap.cpp b/src/map/osmdroidmap.cpp
index 93b4f844..67e7df7e 100644
--- a/src/map/osmdroidmap.cpp
+++ b/src/map/osmdroidmap.cpp
@@ -1,6 +1,7 @@
 #include <QSqlQuery>
 #include <QSqlRecord>
 #include <QSqlField>
+#include <QSqlError>
 #include <QPainter>
 #include <QPixmapCache>
 #include <QImageReader>
@@ -18,12 +19,15 @@ OsmdroidMap::OsmdroidMap(const QString &fileName, QObject *parent)
 {
 	quint64 z, l = 0, r = 0, t = 0, b = 0;
 
+	if (!Util::isSQLiteDB(fileName, _errorString))
+		return;
+
 	_db = QSqlDatabase::addDatabase("QSQLITE", fileName);
 	_db.setDatabaseName(fileName);
 	_db.setConnectOptions("QSQLITE_OPEN_READONLY");
 
 	if (!_db.open()) {
-		_errorString = "Error opening database file";
+		_errorString = _db.lastError().text();
 		return;
 	}
 
diff --git a/src/map/sqlitemap.cpp b/src/map/sqlitemap.cpp
index c03ae9e3..b35dc1d0 100644
--- a/src/map/sqlitemap.cpp
+++ b/src/map/sqlitemap.cpp
@@ -1,6 +1,7 @@
 #include <QSqlQuery>
 #include <QSqlRecord>
 #include <QSqlField>
+#include <QSqlError>
 #include <QPainter>
 #include <QPixmapCache>
 #include <QImageReader>
@@ -16,12 +17,15 @@
 SqliteMap::SqliteMap(const QString &fileName, QObject *parent)
   : Map(fileName, parent), _mapRatio(1.0), _valid(false)
 {
+	if (!Util::isSQLiteDB(fileName, _errorString))
+		return;
+
 	_db = QSqlDatabase::addDatabase("QSQLITE", fileName);
 	_db.setDatabaseName(fileName);
 	_db.setConnectOptions("QSQLITE_OPEN_READONLY");
 
 	if (!_db.open()) {
-		_errorString = "Error opening database file";
+		_errorString = _db.lastError().text();
 		return;
 	}