diff --git a/plugins/org.eclipse.sirius.diagram.ui/src-diag/org/eclipse/sirius/diagram/ui/internal/refresh/GMFHelper.java b/plugins/org.eclipse.sirius.diagram.ui/src-diag/org/eclipse/sirius/diagram/ui/internal/refresh/GMFHelper.java
index f94b4723ca..b49ae8d82a 100644
--- a/plugins/org.eclipse.sirius.diagram.ui/src-diag/org/eclipse/sirius/diagram/ui/internal/refresh/GMFHelper.java
+++ b/plugins/org.eclipse.sirius.diagram.ui/src-diag/org/eclipse/sirius/diagram/ui/internal/refresh/GMFHelper.java
@@ -45,12 +45,14 @@
 import org.eclipse.gmf.runtime.notation.Bounds;
 import org.eclipse.gmf.runtime.notation.Diagram;
 import org.eclipse.gmf.runtime.notation.Edge;
+import org.eclipse.gmf.runtime.notation.FontStyle;
 import org.eclipse.gmf.runtime.notation.LayoutConstraint;
 import org.eclipse.gmf.runtime.notation.Location;
 import org.eclipse.gmf.runtime.notation.Node;
 import org.eclipse.gmf.runtime.notation.NotationPackage;
 import org.eclipse.gmf.runtime.notation.RelativeBendpoints;
 import org.eclipse.gmf.runtime.notation.Size;
+import org.eclipse.gmf.runtime.notation.Style;
 import org.eclipse.gmf.runtime.notation.View;
 import org.eclipse.gmf.runtime.notation.datatype.RelativeBendpoint;
 import org.eclipse.jface.resource.ImageDescriptor;
@@ -1086,7 +1088,16 @@ public static Dimension getLabelDimension(Node node, Dimension defaultDimension)
             if (!new DDiagramElementQuery(dDiagramElement).isLabelHidden()) {
                 if (siriusStyle instanceof BasicLabelStyle) {
                     BasicLabelStyle bls = (BasicLabelStyle) siriusStyle;
-                    Font defaultFont = VisualBindingManager.getDefault().getFontFromLabelStyle(bls, (String) viewQuery.getDefaultValue(NotationPackage.Literals.FONT_STYLE__FONT_NAME));
+                    String fontName = (String) viewQuery.getDefaultValue(NotationPackage.Literals.FONT_STYLE__FONT_NAME);
+                    Style style = node.getStyle(NotationPackage.eINSTANCE.getFontStyle());
+                    if (style instanceof FontStyle) {
+                        String currentFontName = ((FontStyle) style).getFontName();
+                        if (currentFontName != null && !currentFontName.isEmpty()) {
+                            // Use the defined font name in the node if it is defined.
+                            fontName = currentFontName;
+                        }
+                    }
+                    Font defaultFont = VisualBindingManager.getDefault().getFontFromLabelStyle(bls, fontName);
                     try {
                         labelSize = FigureUtilities.getStringExtents(dDiagramElement.getName(), defaultFont);
                         if (bls.isShowIcon()) {