diff --git a/ASAP/annotation/RectangleAnnotationTool.cpp b/ASAP/annotation/RectangleAnnotationTool.cpp
index 7c51bc2e..63c27091 100644
--- a/ASAP/annotation/RectangleAnnotationTool.cpp
+++ b/ASAP/annotation/RectangleAnnotationTool.cpp
@@ -117,7 +117,7 @@ void RectangleAnnotationTool::mouseDoubleClickEvent(QMouseEvent *event) {
     std::vector<double> spacing = local_img->getSpacing();
     QString suffix(" pixels");
     if (spacing.size() > 1) {
-      suffix = QString::fromUtf8(u8" µm");
+      suffix = QString::fromUtf8(u8" \u03bcm");
     }
     QDialog* createRectDiaglog = new QDialog();
     createRectDiaglog->setWindowTitle("Specify width and height for rectangular annotations");
@@ -211,4 +211,4 @@ QAction* RectangleAnnotationTool::getToolButton() {
 
 std::string RectangleAnnotationTool::name() {
   return std::string("rectangleannotation");
-}
\ No newline at end of file
+}