diff --git a/src/Mod/TechDraw/App/LineGenerator.cpp b/src/Mod/TechDraw/App/LineGenerator.cpp
index 1088e83411..fe98786a00 100644
--- a/src/Mod/TechDraw/App/LineGenerator.cpp
+++ b/src/Mod/TechDraw/App/LineGenerator.cpp
@@ -127,7 +127,7 @@ QPen LineGenerator::getLinePen(size_t lineNumber, double nominalLineWidth)
     // there are some lines with numbers >1 that are also continuous, and
     // a dash pattern is not applicable.
     std::string naToken{"n/a"};
-    if (elements.empty() or elements.front() == naToken) {
+    if (elements.empty() || elements.front() == naToken) {
         // plain boring solid line (or possibly an invalid line number)
         linePen.setStyle(Qt::SolidLine);
         return linePen;
diff --git a/src/Mod/TechDraw/App/LineGenerator.h b/src/Mod/TechDraw/App/LineGenerator.h
index 8237102793..d400b3fef7 100644
--- a/src/Mod/TechDraw/App/LineGenerator.h
+++ b/src/Mod/TechDraw/App/LineGenerator.h
@@ -44,7 +44,7 @@
 
 namespace TechDraw {
 
-class LineGenerator {
+class TechDrawExport LineGenerator {
 public:
     LineGenerator();
     ~LineGenerator() = default;